1.INSERT INTO SELECT语句 语句形式为：Insert into Table2(field1,field2,...) select value1,value2,... from Table1 要求目标表Table2必须存在，由于目标表Table2已经存在，所以我们除了插入源表Table1的字段外，还可以插入常量。示例如下：INSERT INTO SELECT语句复制表数据 Insert into Table2(a, c, d) select a,c,5 from Table12.SELECT INTO FROM语句 语句形式为：SELECT vale1, value2 into Table2 from Table1 要求目标表Table2不存在，因为在插入时会自动创建表Table2，并将Table1中指定字段数据复制到Table2中。示例如下：SELECT INTO FROM语句创建表Table2并复制数据 select a,c INTO Table2 from Table1
更新语句一
UPDATE A SET A.c2 =B.c3
from A ,B
where A.c1=B.c1
更新语句二
UPDATE A
SET A.c2 =B.c3
from A inner join B on A.c1=B.c1
删除语句
1、 delete from t1 where 条件
2、delete t1 from t1 where 条件
3、 delete t1 from t1,t2 where 条件
4、delete t1,t2 from t1,t2 where 条件