mysql性能优化之explain

转自如下两篇mysql http://blog.csdn.net/zhuxineli/article/details/14455029 http://database.51cto.com/art/201108/284783.htmweb 1.使用explain语句去查看分析结果sql 如explain select * from test1 where id=1;会出现：id selecttype

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