需要加快MySQL查询

debugcn 发表于 Dev

拉维

我有一个查询，该查询用于获取各种输入来计算资产排名。为了获得各种值以根据用户输入来计算资产等级，我正在对一个表使用多个子查询。但是，这花费了太多时间。谁能帮我即兴查询吗？

 SELECT AssetId,
       AssetName,
       Isin,

  (SELECT DClose
   FROM eod_data
   WHERE Isin=a.Isin
     AND DDate >= now()-interval 12 MONTH
   ORDER BY DDate ASC LIMIT 1) AS rafval,

  (SELECT DClose
   FROM eod_data
   WHERE Isin=a.Isin
     AND DDate >= now()-interval 12 MONTH
   ORDER BY DDate DESC LIMIT 1) AS ralval,

  (SELECT DClose
   FROM eod_data
   WHERE Isin=a.Isin
     AND DDate >= now()-interval 3 MONTH
   ORDER BY DDate ASC LIMIT 1) AS rbfval,

  (SELECT DClose
   FROM eod_data
   WHERE Isin=a.Isin
     AND DDate >= now()-interval 3 MONTH
   ORDER BY DDate DESC LIMIT 1) AS rblval,

  (SELECT DClose
   FROM eod_data
   WHERE Isin=a.Isin
     AND DDate >= now()-interval 20 DAY
   ORDER BY DDate ASC LIMIT 1) AS rcfval,

  (SELECT DClose
   FROM eod_data
   WHERE Isin=a.Isin
     AND DDate >= now()-interval 20 DAY
   ORDER BY DDate DESC LIMIT 1) AS rclval,

  (SELECT STD(DClose)
   FROM eod_data
   WHERE Isin=a.Isin
     AND DDate >= now()-interval 20 DAY
   ORDER BY DDate DESC LIMIT 1) AS vstd
FROM assets a
INNER JOIN assetclasses ac ON ac.AssetClassId=a.AssetClassId
INNER JOIN assetsubgroups asg ON asg.AssetSubGroupId=ac.AssetSubGroupId
WHERE asg.AssetGroupId=1
  AND a.IsActive=1;

在上面的查询中，子查询中提到的所有间隔都是变量。它们来自用户输入。包含1000个资产的资产表，并且eod_data将包含数百万条记录。

我还为where子句中涉及的所有字段创建了索引。

表结构资产：AssetId，AssetName，Isin，IsActive | eod_data：Isin，DClose，DDate

上面的查询耗时将近11分钟。

提前致谢。

请在此处找到示例数据库http://sqlfiddle.com/#!9/d0a50/3

伯恩德·布芬（Bernd Buffen）

这是我的下一个尝试。我已经测试了一些不同的加入。这是最快的方法（快1400倍）。STD（）列暂时未实现。您能检查一下其他输出是否正确吗

..以及带有STD（）的决赛（我希望如此）。

SELECT 
    a.AssetId
    , a.AssetName
    , a.Isin
    , CAST(COALESCE(ed2.DClose,0) AS DECIMAL(20,4)) AS rafval
    , CAST(COALESCE(ed3.DClose,0) AS DECIMAL(20,4)) AS ralval
    , CAST(COALESCE(ed4.DClose,0) AS DECIMAL(20,4)) AS rbfval
    , CAST(COALESCE(ed5.DClose,0) AS DECIMAL(20,4)) AS rblval
    , CAST(COALESCE(ed6.DClose,0) AS DECIMAL(20,4)) AS rcfval
    , CAST(COALESCE(ed7.DClose,0) AS DECIMAL(20,4)) AS rclval
    , COALESCE(ed.vstd,0) AS vstd
FROM (
    SELECT  
    ed.Isin
        , MIN(IF( DDate >= now()-INTERVAL 12 MONTH, EodDataId, NULL)) AS id_rafval
        , MAX(IF( DDate >= now()-INTERVAL 12 MONTH, EodDataId, NULL)) AS id_ralval
        , MIN(IF( DDate >= now()-INTERVAL  3 MONTH, EodDataId, NULL)) AS id_rbfval
        , MAX(IF( DDate >= now()-INTERVAL  3 MONTH, EodDataId, NULL)) AS id_rblval
        , MIN(IF( DDate >= now()-INTERVAL 40 DAY  , EodDataId, NULL)) AS id_rcfval
        , MAX(IF( DDate >= now()-INTERVAL 40 DAY  , EodDataId, NULL)) AS id_rclval
        , std(IF( DDate >= now()-INTERVAL 40 DAY  , NULL, DClose )) AS vstd
    FROM eod_data ed
    WHERE ed.DDate >= now()-INTERVAL 12 MONTH
    GROUP BY ed.Isin
    ORDER BY ed.EodDataId ASC
    ) ed
LEFT JOIN eod_data ed2 ON ed2.Isin = ed.Isin AND ed2.EodDataId = ed.id_rafval
LEFT JOIN eod_data ed3 ON ed3.Isin = ed.Isin AND ed3.EodDataId = ed.id_ralval
LEFT JOIN eod_data ed4 ON ed4.Isin = ed.Isin AND ed4.EodDataId = ed.id_rbfval
LEFT JOIN eod_data ed5 ON ed5.Isin = ed.Isin AND ed5.EodDataId = ed.id_rblval
LEFT JOIN eod_data ed6 ON ed6.Isin = ed.Isin AND ed6.EodDataId = ed.id_rcfval
LEFT JOIN eod_data ed7 ON ed7.Isin = ed.Isin AND ed7.EodDataId = ed.id_rclval
INNER JOIN assets a ON a.Isin = ed.Isin
INNER JOIN assetclasses ac ON ac.AssetClassId=a.AssetClassId
INNER JOIN assetsubgroups asg ON asg.AssetSubGroupId=ac.AssetSubGroupId
WHERE asg.AssetGroupId=1
  AND a.IsActive=1
ORDER BY a.AssetId;
SELECT 
    a.AssetId
    , a.AssetName
    , a.Isin
    , CAST(COALESCE(ed2.DClose,0) AS DECIMAL(20,4)) AS rafval
    , CAST(COALESCE(ed3.DClose,0) AS DECIMAL(20,4)) AS ralval
    , CAST(COALESCE(ed4.DClose,0) AS DECIMAL(20,4)) AS rbfval
    , CAST(COALESCE(ed5.DClose,0) AS DECIMAL(20,4)) AS rblval
    , CAST(COALESCE(ed6.DClose,0) AS DECIMAL(20,4)) AS rcfval
    , CAST(COALESCE(ed7.DClose,0) AS DECIMAL(20,4)) AS rclval
FROM (
    SELECT  
    ed.Isin
        , MIN(IF( DDate >= now()-INTERVAL 12 MONTH, EodDataId, NULL)) AS id_rafval
        , MAX(IF( DDate >= now()-INTERVAL 12 MONTH, EodDataId, NULL)) AS id_ralval
        , MIN(IF( DDate >= now()-INTERVAL  3 MONTH, EodDataId, NULL)) AS id_rbfval
        , MAX(IF( DDate >= now()-INTERVAL  3 MONTH, EodDataId, NULL)) AS id_rblval
        , MIN(IF( DDate >= now()-INTERVAL 20 DAY  , EodDataId, NULL)) AS id_rcfval
        , MAX(IF( DDate >= now()-INTERVAL 20 DAY  , EodDataId, NULL)) AS id_rclval
    FROM eod_data ed
    WHERE ed.DDate >= now()-INTERVAL 12 MONTH
    GROUP BY ed.Isin
    ORDER BY ed.DDate ASC
    ) ed
LEFT JOIN eod_data ed2 ON ed2.Isin = ed.Isin AND ed2.EodDataId = ed.id_rafval
LEFT JOIN eod_data ed3 ON ed3.Isin = ed.Isin AND ed3.EodDataId = ed.id_ralval
LEFT JOIN eod_data ed4 ON ed4.Isin = ed.Isin AND ed4.EodDataId = ed.id_rbfval
LEFT JOIN eod_data ed5 ON ed5.Isin = ed.Isin AND ed5.EodDataId = ed.id_rblval
LEFT JOIN eod_data ed6 ON ed6.Isin = ed.Isin AND ed6.EodDataId = ed.id_rcfval
LEFT JOIN eod_data ed7 ON ed7.Isin = ed.Isin AND ed7.EodDataId = ed.id_rclval
INNER JOIN assets a ON a.Isin = ed.Isin
INNER JOIN assetclasses ac ON ac.AssetClassId=a.AssetClassId
INNER JOIN assetsubgroups asg ON asg.AssetSubGroupId=ac.AssetSubGroupId
WHERE asg.AssetGroupId=1
  AND a.IsActive=1
ORDER BY a.AssetId;

您可以再测试一次吗？

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