2009年8月27日

The IN() operator is not a performance problem in MySQL but the equivalent OR is

摘要： http://forums.devshed.com/mysql-help-4/inefficiency-of-in-clause-631109.html 阅读全文

posted @ 2009-08-27 21:57 cy163 阅读(170) 评论(0) 推荐(0) 编辑

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