求教如何优化这条SQL语句?

【求教如何优化这条SQL语句?】

求教如何优化这条SQL语句?

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如何优化这条SQL语句?如何优化这条SQL语句?简介:SQL语句如下:select user _ name,password,nick _ name from t _ app _ users where to find _ in _ set(merchant _ id,get