nysql索引

Posted 2021-01-19 包子的烦恼

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参考文献来自https://www.cnblogs.com/morewindows0/p/9223671.html

下面为自己做的测试，记下来以防忘记

EXPLAIN select * from suoyin_test where c2=\'a1\'

EXPLAIN select * from suoyin_test where c2=\'a1\' and c1=\'a1\'

EXPLAIN select * from suoyin_test where c1 like \'a1%\' and c2=\'a1\'

EXPLAIN select * from suoyin_test where c1 like \'a1%\' and c3=\'a1\'

EXPLAIN select * from suoyin_test where c1=\'a1%\' and c2=\'a1\' ORDER BY c3

EXPLAIN select * from suoyin_test where c1=\'a1%\' and c3=\'a1\' ORDER BY c2

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