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增:

insert

insert into 表名(字段1,字段2,字段3。。。。。。字段N) values(值1,值2,值3);

如果不申明插入那些字段,则默认所有字段。

在插入时注意,往哪个表增加,增哪个字段,每个字段各有什么值。

删:

delete

delete from 表名 where 表达式;

删除时注意 删除哪张表数据,删除哪些行.

 

改:

update

update 表名 set  字段1=值1,字段2=值2  .......字段N=值N where  表达式;

修改时注意 修改哪张表,修改哪几个字段,该什么值,在那几行生效。

 

查:

select

select * from 表名 where 表达式。

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