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费了半天劲,终于试出来了。UNION本身就子代DISTINCT的功能。甚至每一个SELECT里面都被DINSTINCT了,多个SELECT UNION在一起,不会出现重复。我前面的问题就不正确。不过还是多谢大家。

forex (我认为)
(#278019@0)
2001-11-28 -04:00
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