$mysql->runSql("delete from music_user where did=( select max(did) from music_user)");;
表是music_user，找出did字段的最大值，然后将有最大值的行删除
像这条代码可以吗？
嗯 你的语句看起来是没问题的 可惜mysql 不支持这种写法
需要在查询里面再嵌套一个子查询
delete FROM music_user where did = ( select did from ( select max(did) as did from music_user) as tmp )
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