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EFFECtivE mysql

推荐本SQL优化的书《Effective MySQL之SQL语句最优化》。 主要讲解:如何去分析SQL的性能、索引的原理、如何创建合适的索引、如何去分析线上系统的性能瓶颈...

string sql = "CREATE TEMPORARY TABLE tmp_table SELECT * FROM crsiuser WHERE FirstName='66' AND LastName='66' ORDER BY Effective DESC LIMIT 0,1;(分号) SELECT * FROM tmp_table AS a LEFT JOIN CRsiBiometricTemplate AS b ON a.Unique...

valid :强调有效期,如,this film ticket is valid here only for a weekend film (这张票子只能看周末电影) effective强调有效果,this medicine is quite effective, I am getting better.(这药很有效果。我好多了)

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