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sql的普通索引和复合索引的问题
一辆想出轨的无轨电车
2017-03-08 09:48:34
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假如我在字段A中创建普通单索引，然后又在字段A创建复合索引，但是A不是复合索引
的初始列，现在我只用字段A作为查询条件进行查询，请问会用到索引么，还是全表查询
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一辆想出轨的无轨电车
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巴扎黑
2017-03-08 09:48:57
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会用你A的普通索引来查询
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会用你A的普通索引来查询