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思路就是反过来想就简单了
最后一句这样写就意思明显 SELECT distinct name from (select name from zzxxz where score<=80)
select distinct name from zzxxz where name not in
(select distinct name from zzxxz where score<=80)
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原文地址：http://www.cnblogs.com/zx-admin/p/5663927.html
