给MySQL中数据表添加字段

添加一个char字段：

mysql> alter table stock add src char(20);
Query OK, 3766 rows affected (0.65 sec)
Records: 3766  Duplicates: 0  Warnings: 0

添加一个datatime字段：

mysql> alter table stock add ctime datetime not null;
Query OK, 3766 rows affected (0.27 sec)
Records: 3766  Duplicates: 0  Warnings: 0

查看表定义：

mysql> desc stock;
+-------+----------+------+-----+---------+-------+
| Field | Type     | Null | Key | Default | Extra |
+-------+----------+------+-----+---------+-------+
| id    | int(11)  | NO   | PRI |         |       |
| code  | char(6)  | YES  |     | NULL    |       |
| name  | char(10) | YES  |     | NULL    |       |
| utime | datetime | YES  |     | NULL    |       |
| src   | char(20) | YES  |     | NULL    |       |
| ctime | datetime | NO   |     |         |       |
+-------+----------+------+-----+---------+-------+
6 rows in set (0.05 sec)

--2020年5月3日--