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DISTINCT应该是处理RESULT的,不论这RESULT是如何得来的。我做过的一个SQL IMPLEMENTATION(非著名产品)就是这样设计的。不过我确实没在其它DB上试过,一般的应用在设计时就避免用UNION。

doors (道士)
(#277999@0)
2001-11-28 -04:00
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