请教一个联合查询的问题，在下面两条查询语句中不同的地方是CM.memberid <> M.id这个两个表的关联id是否相等。但是我查询的结果却是一样的，而我觉得这两条语句的逻辑关系正好相反。请大家看看.....

strSql="select distinct M.id, M.* from [Member] as m ,[ClubMember] as CM where CM.memberid <> M.id and m.comefrom = 'yigong' order by M.id desc"

strSql="select distinct M.id, M.* from [Member] as m ,[ClubMember] as CM where CM.memberid = M.id and CM.comefrom = 'yigong' order by M.id desc"