MYSQL5.8----M2

mysql> SHOW DATABASES;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| m1                 |
| mon                |
| mysql              |
| performance_schema |
| quan；             |
| quanbbs            |
| quantest           |
| quantesttwo        |
| sys                |
+--------------------+
10 rows in set (0.02 sec)
 
mysql> use mon
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
 
Database changed
mysql> SHOW TABLES;
+---------------+
| Tables_in_mon |
+---------------+
| ALT           |
| fa            |
| father        |
| nu            |
| numm          |
| nummm         |
| qqq           |
| son           |
| ss            |
| tp3           |
| tp4           |
| tp5           |
| tp6           |
| user          |
+---------------+
14 rows in set (0.00 sec)
 
mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
mysql> SELECT username,id,sex FROM user;
+----------+----+------+
| username | id | sex  |
+----------+----+------+
| 小强     |  1 |    0 |
| 小xx     |  2 |    0 |
| 小jj     |  3 |    0 |
| 小米     |  4 |    0 |
| 小xiao   |  6 |    0 |
| root     |  7 |    0 |
+----------+----+------+
6 rows in set (0.00 sec)
mysql> SELECT user.id,user.username as un FROM user;
+----+---------+
| id | un      |
+----+---------+
|  1 | 小强    |
|  2 | 小xx    |
|  3 | 小jj    |
|  4 | 小米    |
|  6 | 小xiao  |
|  7 | root    |
+----+---------+
6 rows in set (0.00 sec)
mysql> mysql> SELECT u.id,u.username AS un FROM user AS u;
+----+---------+
| id | un      |
+----+---------+
|  1 | 小强    |
|  2 | 小xx    |
|  3 | 小jj    |
|  4 | 小米    |
|  6 | 小xiao  |
|  7 | root    |
+----+---------+
6 rows in set (0.00 sec)

mysql> SELECT * FROM user WHERE sex = 0;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
6 rows in set (0.00 sec)
 
mysql> SELECT * FROM user WHERE age = 25;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
3 rows in set (0.00 sec)
mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----------+-----------
| id | username | pwd                              | sex  | age  | edu | classname | province
+----+----------+----------------------------------+------+------+-----+-----------+-----------
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津
+----+----------+----------------------------------+------+------+-----+-----------+-----------
6 rows in set (0.00 sec)
 
mysql> SELECT  age FROM user GROUP BY age;
+------+
| age  |
+------+
|   25 |
|   35 |
|   83 |
|  116 |
+------+
4 rows in set (0.00 sec)

mysql> mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
6 rows in set (0.00 sec)
 
mysql> SELECT age FROM user  GROUP BY age;
+------+
| age  |
+------+
|   25 |
|   35 |
|   83 |
|  116 |
+------+
4 rows in set (0.00 sec)
 
mysql> SELECT age FROM user  GROUP BY age HAVING count(id) > 2;
+------+
| age  |
+------+
|   25 |
+------+
1 row in set (0.13 sec)
mysql> SELECT *  FROM user  HAVING id % 2 = 0 ;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
3 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user  WHERE id % 2 = 0 ;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
3 rows in set (0.00 sec)

mysql> SELECT *  FROM user;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
6 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user ORDER BY id DESC;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
6 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user ORDER BY age ASC;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
6 rows in set (0.00 sec)
mysql> SELECT *  FROM user ORDER BY age ASC,id DESC;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
6 rows in set (0.00 sec)

mysql> SELECT *  FROM user ;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
6 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user LIMIT 2 ;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
| id | username | pwd                              | sex  | age  | edu | classname | province  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+
2 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user LIMIT 3,4 ;
+----+----------+----------------------------------+------+------+-----+-----------+----------+
| id | username | pwd                              | sex  | age  | edu | classname | province |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景     |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门     |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津     |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
3 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user LIMIT 3,3 ;
+----+----------+----------------------------------+------+------+-----+-----------+----------+
| id | username | pwd                              | sex  | age  | edu | classname | province |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景     |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门     |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津     |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
3 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user LIMIT 3,2 ;
+----+----------+----------------------------------+------+------+-----+-----------+----------+
| id | username | pwd                              | sex  | age  | edu | classname | province |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景     |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门     |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
2 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user LIMIT 2,2 ;
+----+----------+----------------------------------+------+------+-----+-----------+----------+
| id | username | pwd                              | sex  | age  | edu | classname | province |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江     |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景     |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
2 rows in set (0.00 sec)
 
mysql> SELECT *  FROM user ORDER BY age DESC LIMIT 2 ;
+----+----------+----------------------------------+------+------+-----+-----------+----------+
| id | username | pwd                              | sex  | age  | edu | classname | province |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门     |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景     |
+----+----------+----------------------------------+------+------+-----+-----------+----------+
2 rows in set (0.00 sec)

mysql> SELECT *  FROM user ;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+-------+
| id | username | pwd                              | sex  | age  | edu | classname | province  | price |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+-------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |  0.00 |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |  0.00 |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |  0.00 |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      |  0.00 |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      |  0.00 |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |  0.00 |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+-------+
6 rows in set (0.00 sec)
 
mysql> UPDATE user SET price = age*edu  WHERE  id % 2 =0;
Query OK, 3 rows affected (0.09 sec)
Rows matched: 3  Changed: 3  Warnings: 0
 
mysql> SELECT *  FROM user ;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
| id | username | pwd                              | sex  | age  | edu | classname | province  | price  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |   0.00 |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |  70.00 |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |   0.00 |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      | 249.00 |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      | 348.00 |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |   0.00 |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
6 rows in set (0.00 sec)
 
mysql> UPDATE user SET price = age*edu*1.5  WHERE  id % 2 =1;
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3  Changed: 3  Warnings: 0
 
mysql> SELECT *  FROM user ;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
| id | username | pwd                              | sex  | age  | edu | classname | province  | price  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |  75.00 |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |  70.00 |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |  75.00 |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      | 249.00 |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      | 348.00 |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |  75.00 |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
6 rows in set (0.00 sec)
 
mysql> SELECT AVG(price) FROM user;
+------------+
| AVG(price) |
+------------+
| 148.666667 |
+------------+
1 row in set (0.36 sec)
 
mysql> SELECT ROUND(AVG(price)) FROM user;
+-------------------+
| ROUND(AVG(price)) |
+-------------------+
|               149 |
+-------------------+
1 row in set (0.01 sec)
 
mysql> SELECT ROUND(AVG(price),2) FROM user;
+---------------------+
| ROUND(AVG(price),2) |
+---------------------+
|              148.67 |
+---------------------+
1 row in set (0.00 sec)
mysql> SELECT id,username,price FROM user WHERE price > 148.67;
+----+----------+--------+
| id | username | price  |
+----+----------+--------+
|  4 | 小米     | 249.00 |
|  6 | 小xiao   | 348.00 |
+----+----------+--------+
2 rows in set (0.09 sec)
 
mysql> SELECT id,username,price FROM user WHERE price < 148.67;
+----+----------+-------+
| id | username | price |
+----+----------+-------+
|  1 | 小强     | 75.00 |
|  2 | 小xx     | 70.00 |
|  3 | 小jj     | 75.00 |
|  7 | root     | 75.00 |
+----+----------+-------+
4 rows in set (0.00 sec)
 
mysql> SELECT id,username,price FROM user WHERE price >(SELECT ROUND(AVG(price),2) FROM user);
+----+----------+--------+
| id | username | price  |
+----+----------+--------+
|  4 | 小米     | 249.00 |
|  6 | 小xiao   | 348.00 |
+----+----------+--------+
2 romysql> SELECT price FROM user WHERE classname = 'jave';
+-------+
| price |
+-------+
| 75.00 |
| 70.00 |
+-------+
2 rows in set (0.00 sec)
ws in set (0.00 sec)
mysql> SELECT username,price FROM user WHERE classname = 'jave';
+----------+-------+
| username | price |
+----------+-------+
| 小强     | 75.00 |
| 小xx     | 70.00 |
+----------+-------+
2 rows in set (0.00 sec)
mysql> SELECT username,price FROM user WHERE price > ANY (SELECT price FROM user WHERE classname = 'jave');
+----------+--------+
| username | price  |
+----------+--------+
| 小强     |  75.00 |
| 小jj     |  75.00 |
| 小米     | 249.00 |
| 小xiao   | 348.00 |
| root     |  75.00 |
+----------+--------+
5 rows in set (0.09 sec)
 
mysql> SELECT username,classname,price FROM user WHERE price > ANY (SELECT price FROM user WHERE classname = 'jave');
+----------+-----------+--------+
| username | classname | price  |
+----------+-----------+--------+
| 小强     | jave      |  75.00 |
| 小jj     | javed     |  75.00 |
| 小米     | py        | 249.00 |
| 小xiao   | py        | 348.00 |
| root     | dada      |  75.00 |
+----------+-----------+--------+
5 rows in set (0.00 sec)
 
mysql> SELECT username,classname,price FROM user WHERE price >= ANY (SELECT price FROM user WHERE classname = 'jave');
+----------+-----------+--------+
| username | classname | price  |
+----------+-----------+--------+
| 小强     | jave      |  75.00 |
| 小xx     | jave      |  70.00 |
| 小jj     | javed     |  75.00 |
| 小米     | py        | 249.00 |
| 小xiao   | py        | 348.00 |
| root     | dada      |  75.00 |
+----------+-----------+--------+
6 rows in set (0.00 sec)

mysql> CREATE TABLE provices(
    -> id INT AUTO_INCREMENT PRIMARY KEY,
    -> name VARCHAR(10) NOT NULL);
Query OK, 0 rows affected (0.14 sec)
mysql> SELECT * FROM provices;
Empty set (0.00 sec)
 
mysql> SELECT province FROM user;
+-----------+
| province  |
+-----------+
| 内蒙古    |
| 内蒙古    |
| 湛江      |
| 背景      |
| 福门      |
| 天津      |
+-----------+
6 rows in set (0.00 sec)
 
mysql> SELECT province FROM user GROUP BY province;
+-----------+
| province  |
+-----------+
| 内蒙古    |
| 天津      |
| 湛江      |
| 福门      |
| 背景      |
+-----------+
5 rows in set (0.00 sec)
mysql> INSERT INTO provices(name) SELECT province FROM user GROUP BY province;
Query OK, 5 rows affected (0.10 sec)
Records: 5  Duplicates: 0  Warnings: 0
 
mysql> SELECT * FROM provices;
+----+-----------+
| id | name      |
+----+-----------+
|  1 | 内蒙古    |
|  2 | 天津      |
|  3 | 湛江      |
|  4 | 福门      |
|  5 | 背景      |
+----+-----------+
5 rows in set (0.00 sec)
 
mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----------+----
| id | username | pwd                              | sex  | age  | edu | classname | pro
+----+----------+----------------------------------+------+------+-----+-----------+----
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津
+----+----------+----------------------------------+------+------+-----+-----------+----
6 rows in set (0.00 sec)
mysql> UPDATE user INNER JOIN provices ON user.province = provices.name SET user.provinc
Query OK, 6 rows affected (0.01 sec)
Rows matched: 6  Changed: 6  Warnings: 0
 
mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----------+----
| id | username | pwd                              | sex  | age  | edu | classname | pro
+----+----------+----------------------------------+------+------+-----+-----------+----
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 1
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 1
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 3
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 5
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 4
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 2
+----+----------+----------------------------------+------+------+-----+-----------+----
6 rows in set (0.00 sec)

mysql> CREATE TABLE class(
    -> id INT AUTO_INCREMENT PRIMARY KEY,
    -> classname VARCHAR(20) NOT NULL)
    -> SELECT classname FROM user GROUP BY classname;
Query OK, 4 rows affected (0.05 sec)
Records: 4  Duplicates: 0  Warnings: 0
 
mysql> SELECT * FROM class
    -> ;
+----+-----------+
| id | classname |
+----+-----------+
|  1 | dada      |
|  2 | jave      |
|  3 | javed     |
|  4 | py        |
+----+-----------+
4 rows in set (0.00 sec)
mysql> UPDATE user INNER JOIN class ON user.classname = class.classname SET user.classna
Query OK, 6 rows affected (0.00 sec)
Rows matched: 6  Changed: 6  Warnings: 0
 
mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----------+----
| id | username | pwd                              | sex  | age  | edu | classname | pro
+----+----------+----------------------------------+------+------+-----+-----------+----
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | 2         | 1
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | 2         | 1
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | 3         | 3
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | 4         | 5
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | 4         | 4
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | 1         | 2
+----+----------+----------------------------------+------+------+-----+-----------+----
6 rows in set (0.00 sec)
mysql> DESC user;
+-----------+--------------+------+-----+---------+----------------+
| Field     | Type         | Null | Key | Default | Extra          |
+-----------+--------------+------+-----+---------+----------------+
| id        | int(11)      | NO   | PRI | NULL    | auto_increment |
| username  | varchar(20)  | NO   |     | NULL    |                |
| pwd       | char(32)     | NO   |     | NULL    |                |
| sex       | tinyint(4)   | YES  |     | 0       |                |
| age       | tinyint(4)   | YES  |     | 18      |                |
| edu       | tinyint(4)   | NO   |     | 2       |                |
| classname | varchar(10)  | NO   |     | NULL    |                |
| province  | varchar(10)  | NO   |     | NULL    |                |
| price     | decimal(8,2) | NO   |     | NULL    |                |
+-----------+--------------+------+-----+---------+----------------+
9 rows in set (0.15 sec)
mysql> ALTER TABLE user CHANGE classname cid TINYINT UNSIGNED NOT NULL, CHANGE province
Query OK, 6 rows affected (0.04 sec)
Records: 6  Duplicates: 0  Warnings: 0
mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----+-------+--
| id | username | pwd                              | sex  | age  | edu | cid | proid | p
+----+----------+----------------------------------+------+------+-----+-----+-------+--
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 |   2 |     1 |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 |   2 |     1 |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 |   3 |     3 |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 |   4 |     5 | 2
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 |   4 |     4 | 3
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 |   1 |     2 |
+----+----------+----------------------------------+------+------+-----+-----+-------+--
6 rows in set (0.00 sec)

mysql> SELECT user.id,user.username,class.classname AS cname FROM user INNER JOIN class ON user.cid = class.id;
+----+----------+-------+
| id | username | cname |
+----+----------+-------+
|  1 | 小强     | jave  |
|  2 | 小xx     | jave  |
|  3 | 小jj     | javed |
|  4 | 小米     | py    |
|  6 | 小xiao   | py    |
|  7 | root     | dada  |
+----+----------+-------+
6 rows in set (0.03 sec)
 
mysql> SELECT u.id,u.username,c.classname FROM user AS u LEFT JOIN class AS c ON u.cid = c.id;^C
mysql> INSERT INTO user (username,pwd,age,edu,cid,proid,price) VALUES('QQ',md5(1234),66,3,7,4,888.99);
Query OK, 1 row affected (0.01 sec)
 
mysql> SELECT * FROM user;
+----+----------+----------------------------------+------+------+-----+-----+-------+--------+
| id | username | pwd                              | sex  | age  | edu | cid | proid | price  |
+----+----------+----------------------------------+------+------+-----+-----+-------+--------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 |   2 |     1 |  75.00 |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 |   2 |     1 |  70.00 |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 |   3 |     3 |  75.00 |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 |   4 |     5 | 249.00 |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 |   4 |     4 | 348.00 |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 |   1 |     2 |  75.00 |
|  8 | QQ       | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   66 |   3 |   7 |     4 | 888.99 |
+----+----------+----------------------------------+------+------+-----+-----+-------+--------+
7 rows in set (0.00 sec)
 
mysql> SELECT * FROM class;
+----+-----------+
| id | classname |
+----+-----------+
|  1 | dada      |
|  2 | jave      |
|  3 | javed     |
|  4 | py        |
+----+-----------+
4 rows in set (0.00 sec)
 
mysql> SELECT u.id,u.username,c.classname FROM user AS u LEFT JOIN class AS c ON u.cid = c.id;
+----+----------+-----------+
| id | username | classname |
+----+----------+-----------+
|  7 | root     | dada      |
|  1 | 小强     | jave      |
|  2 | 小xx     | jave      |
|  3 | 小jj     | javed     |
|  4 | 小米     | py        |
|  6 | 小xiao   | py        |
|  8 | QQ       | NULL      |
+----+----------+-----------+
7 rows in set (0.00 sec)
 
mysql> SELECT u.id,u.username,c.classname FROM user AS u RIGHT JOIN class AS c ON u.cid = c.id;
+------+----------+-----------+
| id   | username | classname |
+------+----------+-----------+
|    1 | 小强     | jave      |
|    2 | 小xx     | jave      |
|    3 | 小jj     | javed     |
|    4 | 小米     | py        |
|    6 | 小xiao   | py        |
|    7 | root     | dada      |
+------+----------+-----------+
6 rows in set (0.00 sec)

多表连接：

mysql> SELECT u.id,u.username,u.pwd,u.sex,u.age,u.edu,c.classname,p.name,u.price FROM user AS u INNER JOIN class AS c ON c.id =u.cid INNER JOIN provices AS p ON p.id = u.proid;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
| id | username | pwd                              | sex  | age  | edu | classname | name      | price  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |  75.00 |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |  70.00 |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |  75.00 |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      | 249.00 |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      | 348.00 |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |  75.00 |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
6 rows in set (0.00 sec)
 
mysql> SELECT u.id,u.username,u.pwd,u.sex,u.age,u.edu,c.classname,p.name,u.price FROM user AS u ,class AS c,provices AS p WHERE u.cid = c.id AND u.proid = p.id;
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
| id | username | pwd                              | sex  | age  | edu | classname | name      | price  |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
|  1 | 小强     | 202cb962ac59075b964b07152d234b70 |    0 |   25 |   2 | jave      | 内蒙古    |  75.00 |
|  2 | 小xx     | 202cb962ac59075b964b07152d234b70 |    0 |   35 |   2 | jave      | 内蒙古    |  70.00 |
|  3 | 小jj     | 81dc9bdb52d04dc20036dbd8313ed055 |    0 |   25 |   2 | javed     | 湛江      |  75.00 |
|  4 | 小米     | 5eac43aceba42c8757b54003a58277b5 |    0 |   83 |   3 | py        | 背景      | 249.00 |
|  6 | 小xiao   | 09a6f4ead95fb05ee29ab9e7d1219e33 |    0 |  116 |   3 | py        | 福门      | 348.00 |
|  7 | root     | f356355c1634839cf42769e7f30905a3 |    0 |   25 |   2 | dada      | 天津      |  75.00 |
+----+----------+----------------------------------+------+------+-----+-----------+-----------+--------+
6 rows in set (0.00 sec)

子表：

mysql> CREATE TABLE class_type(
    -> id INT AUTO_INCREMENT PRIMARY KEY,
    -> name VARCHAR(20) NOT NULL,
    -> pid INT UNSIGNED NOT NULL DEFAULT 0);
Query OK, 0 rows affected (0.49 sec)
mysql> DESC class_type;
+-------+------------------+------+-----+---------+----------------+
| Field | Type             | Null | Key | Default | Extra          |
+-------+------------------+------+-----+---------+----------------+
| id    | int(11)          | NO   | PRI | NULL    | auto_increment |
| name  | varchar(20)      | NO   |     | NULL    |                |
| pid   | int(10) unsigned | NO   |     | 0       |                |
+-------+------------------+------+-----+---------+----------------+
3 rows in set (0.01 sec)
mysql> INSERT INTO class_type values(null,"java开发",2);
Query OK, 1 row affected (0.09 sec)
mysql> INSERT INTO class_type values(null,"h5开发",2);
Query OK, 1 row affected (0.36 sec)
 
mysql> INSERT INTO class_type values(null,"linux运维",2);
Query OK, 1 row affected (0.01 sec)
 
mysql> SELECT * FROM class_type;
+----+-------------+-----+
| id | name        | pid |
+----+-------------+-----+
|  1 | java开发    |   2 |
|  2 | h5开发      |   2 |
|  3 | linux运维   |   2 |
+----+-------------+-----+
3 rows in set (0.00 sec)
 
mysql> INSERT INTO class_type VALUES(null,"JAVASE",1),(null,"thinkphp",2),(
    -> "laravel",2),
    -> (null,"oststorp",2),
    -> (null,"myslq",4),
    -> (null,"redis",4),
    -> (null,"HTML",3),
    -> (null,"css",3),
    -> (null,"javascript",3);
Query OK, 9 rows affected (0.00 sec)
Records: 9  Duplicates: 0  Warnings: 0
 
mysql> SELECT * FROM class_type;
+----+-------------+-----+
| id | name        | pid |
+----+-------------+-----+
|  1 | java开发    |   2 |
|  2 | h5开发      |   2 |
|  3 | linux运维   |   2 |
|  4 | JAVASE      |   1 |
|  5 | thinkphp    |   2 |
|  6 | laravel     |   2 |
|  7 | oststorp    |   2 |
|  8 | myslq       |   4 |
|  9 | redis       |   4 |
| 10 | HTML        |   3 |
| 11 | css         |   3 |
| 12 | javascript  |   3 |
+----+-------------+-----+
12 rows in set (0.00 sec)
mysql> update class_type set pid = 0 WHERE id = 1 OR id = 2 OR id = 3;
Query OK, 3 rows affected (0.01 sec)
Rows matched: 3  Changed: 3  Warnings: 0
 
mysql> SELECT * FROM class_type;
+----+-------------+-----+
| id | name        | pid |
+----+-------------+-----+
|  1 | java开发    |   0 |
|  2 | h5开发      |   0 |
|  3 | linux运维   |   0 |
|  4 | JAVASE      |   1 |
|  5 | thinkphp    |   2 |
|  6 | laravel     |   2 |
|  7 | oststorp    |   2 |
|  8 | myslq       |   4 |
|  9 | redis       |   4 |
| 10 | HTML        |   3 |
| 11 | css         |   3 |
| 12 | javascript  |   3 |
+----+-------------+-----+
mysql> SELECT s.id,s.name,p.name FROM class_type AS s LEFT JOIN class_type AS p ON s.id = p.id;
+----+-------------+-------------+
| id | name        | name        |
+----+-------------+-------------+
|  1 | java开发    | java开发    |
|  2 | h5开发      | h5开发      |
|  3 | linux运维   | linux运维   |
|  4 | JAVASE      | JAVASE      |
|  5 | thinkphp    | thinkphp    |
|  6 | laravel     | laravel     |
|  7 | oststorp    | oststorp    |
|  8 | myslq       | myslq       |
|  9 | redis       | redis       |
| 10 | HTML        | HTML        |
| 11 | css         | css         |
| 12 | javascript  | javascript  |
+----+-------------+-------------+
12 rows in set (0.00 sec)
mysql> SELECT p.id,p.name,s.name FROM class_type AS p LEFT JOIN class_type AS s ON p.id = s.pid;
+----+-------------+------------+
| id | name        | name       |
+----+-------------+------------+
|  1 | java开发    | JAVASE     |
|  2 | h5开发      | thinkphp   |
|  2 | h5开发      | laravel    |
|  2 | h5开发      | oststorp   |
|  4 | JAVASE      | myslq      |
|  4 | JAVASE      | redis      |
|  3 | linux运维   | HTML       |
|  3 | linux运维   | css        |
|  3 | linux运维   | javascript |
|  5 | thinkphp    | NULL       |
|  6 | laravel     | NULL       |
|  7 | oststorp    | NULL       |
|  8 | myslq       | NULL       |
|  9 | redis       | NULL       |
| 10 | HTML        | NULL       |
| 11 | css         | NULL       |
| 12 | javascript  | NULL       |
+----+-------------+------------+
17 rows in set (0.00 sec)

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