Question

SELECT p.Distributor,
       SUM(r.SalesVolume)                                                                                                          AS Sales,
       CAST(( ( CAST(SUM(r.SalesVolume) AS DECIMAL(14, 4)) / (SELECT SUM(r.SalesVolume)
                                                              FROM   RawData r
                                                                     INNER JOIN Product p
                                                                             ON r.ProductId = p.ProductId
                                                              WHERE  p.Distributor IN( 'TF1', 'WARNER', 'GAUMONT', 'PATHE',
                                                                                       'STUDIOCANAL', 'M6SND', 'FRANCETV' )
                                                                     AND p.VODEST IN ( 'EST' )
                                                                     AND p.ContentFlavor IN ( 'HD' )) ) * 100 ) AS DECIMAL(20, 2)) AS MarketSharesVolume
FROM   RawData r
       INNER JOIN Product p
               ON r.ProductId = p.ProductId
WHERE  p.Distributor IN ( 'TF1', 'WARNER', 'GAUMONT', 'PATHE',
                          'STUDIOCANAL', 'M6SND', 'FRANCETV' )
       AND p.VODEST IN ( 'EST' )
       AND p.ContentFlavor IN ( 'HD' )
GROUP  BY p.Distributor;

以上查询肯定不会很漂亮。基本上，如果您注意到子查询中的WHERE条件，并且主查询是相似的。有没有办法我可以将它们组合起来以减少此查询的大小。还有其他地方我可以尝试减少此查询的大小？寻找建议。

Answer 1

您可以使用SUM ... OVER()上的SUM来计算总计。

SELECT p.Distributor,
       SUM(r.SalesVolume)                                                                          AS Sales,
       CAST(( ( CAST(SUM(r.SalesVolume) AS DECIMAL(14, 4)) / SUM(SUM(r.SalesVolume))
                                                               OVER() ) * 100 ) AS DECIMAL(20, 2)) AS MarketSharesVolume
FROM   RawData r
       INNER JOIN Product p
               ON r.ProductId = p.ProductId
WHERE  p.Distributor IN ( 'TF1', 'WARNER', 'GAUMONT', 'PATHE',
                          'STUDIOCANAL', 'M6SND', 'FRANCETV' )
       AND p.VODEST IN ( 'EST' )
       AND p.ContentFlavor IN ( 'HD' )
GROUP  BY p.Distributor;

SQL：优化查询/减少查询的大小

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