增删改

CRUD操作
1.增加
insert into 表名 values(列的值，列的值)
insert into 表名(列名,列名) values(值，值)

2.删除
delete from 表名
delete from test

delete from 表名 where 条件
delete from test where code='n002'

3.修改
update 表名 set 列名=值
update test set name='回族'

update 表名 set 列名=值 where 条件
update test set name='汉族' where code='n002'