选择：select * from table1 where 范围新增：insert into table1(field1,field2) values(value1,value2)删除：delete from table1 where 范围更改：update table1 set field1=value1 where 范围查找：select * from table1 where field1 like ’%value1%’
insert into class (banming) values (20024)；delete from class where nianji = 2007；alter table class add foreign key (beizhu)；update zlq.qq set id = 01；create table alt.alt (
