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I try use MySQL Workbench 6 to analyze the cost, but they don't show the cost of query.

How i get this costs?

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I don't think MySQL exposes that value in the execution plan –  a_horse_with_no_name May 21 at 14:52
    
Perhaps SHOW PROFILES could be used against any query to show you actual time spent perform intermittent steps of a query. –  RolandoMySQLDBA May 21 at 17:23

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