dsf45346 2013-03-26 21:20
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如何在不进行多次查询的情况下从表中获取数据总和?

I am currently running this query:

SELECT *, COUNT(name) AS ActionCount 
FROM plays 
GROUP BY name 
ORDER BY ActionCount DESC LIMIT 0, 50

To select the most prominent/common names in a game of mine, how would I also get the total sum of the mileage every player drove through without running a query for every one of the 50 users selected above assuming I have a 'mileage' field in every game.

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  • duanhui1869 2013-03-26 21:34
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    I would have expected that:

    SELECT 
      *, 
      COUNT(name) AS ActionCount,
      SUM(mileage) AS totalMileage 
    FROM plays 
    GROUP BY name
    ORDER BY ActionCount DESC LIMIT 0, 50
    

    Would do it.

    It doesn't seem particularly tricky to me?

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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