摘要:
本文摘自:http://www.cnblogs.com/analyzer/articles/1400122.html 速度测试结果: 1) select count(*) from t1,t3 where t1.word2=t3.word2; 很慢(t3.word2上没有索引)2) select... 阅读全文
posted @ 2011-05-29 11:13 水寒 阅读(1011) 评论(0) 推荐(0)
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摘要:
本文摘自:http://www.cnblogs.com/analyzer/articles/1400122.html 速度测试结果: 1) select count(*) from t1,t3 where t1.word2=t3.word2; 很慢(t3.word2上没有索引)2) select... 阅读全文
posted @ 2011-05-29 11:13 水寒 阅读(1011) 评论(0) 推荐(0) |
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