where子句中有两个字段两个字段都有索引那查询时用的时那一个呢
http://www.cnblogs.com/hhqinliang/p/8871857.html http://www.cnblogs.com/hhqinliang/p/8871872.html http://www.cnblogs.com/hhqinliang/p/8872841.html http://www.cnblogs.com/hhqinliang/p/8871916.html
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