MYSQL 插入数据防止重复

Sql代码 insert into tt(name,password) select 'phl','123' from dual where not exists(select * from tt where name='phl' and password='123') insert into tt(name,password) select 'phl','123' from dual where not exists(select * from tt where name='phl' and password='123')这个SQL语句的含义是，如果插入的数据
name='phl',password='123'不存在,则执行插入;