有沒有更好的方法來構建這個 MySQL 查詢以使其運行得更快？

Question

我使用查詢 output 一個排行榜。 其中output按代理商賺取的佣金金額排序。 我注意到運行查詢需要很長時間（+- 30 秒）。 我想知道是否通過以不同的方式構造（或其他解決方案）查詢，我可以使運行時更快。

這是查詢：

SELECT * FROM 
    (SELECT agent, 
        COUNT(*) as sales, 
        (4*(SELECT COUNT(*) 
        FROM Sales Sales2 
        WHERE Sales2.agent=Sales.agent AND finalized_at BETWEEN '2020-11-01 00:00:00' AND '2020-11-27 23:59:59' AND flow=117)) 
        / 
        (SELECT SUM(uren) 
        FROM Uren 
        WHERE datum BETWEEN '2020-11-01 00:00:00' AND '2020-11-27 23:59:59' AND agent=Sales.agent) as sph, 
        (SELECT COUNT(*) 
        FROM Sales Sales3 
        WHERE Sales3.agent=Sales.agent AND finalized_at BETWEEN '2020-11-27 00:00:00' AND '2020-11-27 23:59:59' AND flow=165) as telecom 
    FROM Sales 
    WHERE finalized_at BETWEEN '2020-11-27 00:00:00' AND '2020-11-27 23:59:59' AND flow=117 
    GROUP BY agent ) r 
ORDER BY sales * sph * (case when sph > 1.5 then 10 else 7.5 end ) * 0.5184 + telecom * 3.75 desc;

這是 EXPLAIN 的結果

1   PRIMARY <derived2>  NULL    ALL NULL    NULL    NULL    NULL    165 100.00  Using filesort
2   DERIVED Sales   NULL    ALL NULL    NULL    NULL    NULL    14899   1.11    Using where; Using temporary; Using filesort
5   DEPENDENT SUBQUERY  Sales3  NULL    ALL NULL    NULL    NULL    NULL    14899   0.11    Using where
4   DEPENDENT SUBQUERY  Uren    NULL    ALL NULL    NULL    NULL    NULL    7286    1.11    Using where
3   DEPENDENT SUBQUERY  Sales2  NULL    ALL NULL    NULL    NULL    NULL    14899   0.11    Using where

Answer 1

您可以嘗試截斷這些日期，以便數據庫只考慮全天，從而處理更少的信息。

像這樣：

SELECT * FROM 
    (SELECT agent, 
        COUNT(*) as sales, 
        (4*(SELECT COUNT(*) 
        FROM Sales Sales2 
        WHERE Sales2.agent=Sales.agent AND trunc(finalized_at) BETWEEN '2020-11-01' AND '2020-11-27' AND flow=117)) 
        / 
        (SELECT SUM(uren) 
        FROM Uren 
        WHERE trunc(datum) BETWEEN '2020-11-01' AND '2020-11-27' AND agent=Sales.agent) as sph, 
        (SELECT COUNT(*) 
        FROM Sales Sales3 
        WHERE Sales3.agent=Sales.agent AND trunc(finalized_at) = '2020-11-27' AND flow=165) as telecom 
    FROM Sales 
    WHERE trunc(finalized_at) = '2020-11-27' AND flow=117 
    GROUP BY agent ) r 
ORDER BY sales * sph * (case when sph > 1.5 then 10 else 7.5 end ) * 0.5184 + telecom * 3.75 desc;

這部分：

  finalized_at BETWEEN '2020-11-27 00:00:00' AND '2020-11-27 23:59:59' 

改為：

  trunc(finalized_at) = '2020-11-27'