Posts by lirac • 51 points

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  A: What is the best practice to know if an Row exists in a SELECT in Mysql?

  The ideal would be: SELECT usuario FROM tabela WHERE usuario = 'exemplo'; Considering that the 'user' field will not be repeated (it will be unique or Primary key) and there will be an index created…

  mysql sql select performance

  answered 9 years, 5 months ago lirac 51