SQLSERVER基础语句(一)

1、插入一行数据：
INSERT INTO 表名(列名)VALUES(对应的值);
2、一次性插入多条数据
先建表：
INSERT INTO 新建表名(列表)SELECT 原始表列名 FROM 原始表；
执行时创建表：
SELECT 表名.列名 INTO 新建表名 FROM 原始表；
新建标识列：
SELECT Grade.GradeldName,IDENTITY(int,1,1)as GradeId into AddressList5 From Grade;
更新一行数据：
UPDATE Grade SET GradeldName='123' WHERE GradeldName='oop';
更新全部数据：
UPDATE Grade SET GradeldName='123';
删除数据：
DELETE FROM Grade WHERE GradeId = '1';
DELETE FROM Grade WHERE GradeId='2';
删除表（不建议使用，数据无法恢复）：
TRUNCATE TABLE 表名;
TRUNCATE TABLE AddressList;

查询语句：
SELECT GradeId FROM AddressList1 WHERE GradeldName='123' ;
查询除了‘123’的所有数据：
SELECT GradeldName FROM AddressList1 WHERE GradeldName<>'123';

合并列：
SELECT NAME=GradeldName+'.'+GradeId FROM AddressList5;

查询空值：
SELECT NAME FROM TABLE WHERE EMAIL IS NULL;
SELECT GradeId FROM AddressList1 WHERE GradeldName IS NULL;

查询并添加一行常量默认值学校名称：
SELECT GRADENAME='123','OBTK' AS SCHOOLNAME;
SELECT GradeldName = 'OOP','T153' AS SCHOOLNAME;

排序：
查多少行的排序：
例：查ID小于3的；
SELECT GradeldName AS '年级'  FROM AddressList1 WHERE GradeId<3 ORDER BY GradeId ;;
1、按照列排序
SELECT GradeldName AS '年级' FROM AddressList1  ORDER BY GradeId ;
SELECT GradeldName  AS '年级' ,'T153' AS '学校名称' FROM AddressList1 ORDER BY GradeldName;
2、列升序：
SELECT GradeldName AS '年级' FROM AddressList1  ORDER BY GradeId ASC ;
SELECT GradeldName  AS '年级' ,'T153' AS '学校名称' FROM AddressList1 ORDER BY GradeldName ASC;
3、列降序：
SELECT GradeldName AS '年级' FROM AddressList1  ORDER BY GradeId DESC;

SELECT GradeldName  AS '年级' ,'T153' AS '学校名称' FROM AddressList1 ORDER BY GradeldName DESC;