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复合索引的列顺序判断(一)
2014-11-23 23:25:56 来源: 作者: 【 】 浏览:28
Tags:复合 索引 顺序 判断
复合索引最令人困惑的当属索引列的顺序,不仅依赖于使用该索引的查询,更需考虑排序和分组。前段时候我发了个帖子:where条件顺序和复合索引字段顺序。感兴趣的朋友不妨参与讨论。今天我提个自己的观点。在应用开发阶段,【选择性】是我们首要考虑因素,请看简图: 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