使SQL查询更快更好

我有，我需要从表中收集的销售统计数据，有很多数据汇总的情况。该表有几百万个条目，数据库本身大约22Gb。大量的数据可以玩！使SQL查询更快更好

我有这个工作的查询，但我觉得我应该这样做更好 - 它也很慢。我使用PHP与CentOS的7 SQLSRV扩展连接到MSSQL数据库（ERP系统）

。在此查询

我的PHP变量设置如下：

$customer = '12345'; 
$year = '2016'; 
$compared_year = '2015';

所以，你可能已经猜到了，我收集的销售统计对于给定的客户2016年的每个月和

SELECT 
ProdTr.CustNo AS customernummer, 

(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "01' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_1, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "02' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_2, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "03' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_3, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "04' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_4, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "05' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_5, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "06' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_6, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "07' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_7, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "08' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_8, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "09' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_9, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "10' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_10, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "11' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_11, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $year . "12' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS sum_period_12, 

(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "01' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_1, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "02' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_2, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "03' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_3, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "04' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_4, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "05' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_5, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "06' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_6, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "07' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_7, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "08' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_8, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "09' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_9, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "10' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_10, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "10' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_11, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $year . "11' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS dg_period_12, 

(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "01' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_1, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "02' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_2, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "03' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_3, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "04' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_4, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "05' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_5, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "06' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_6, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "07' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_7, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "08' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_8, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "09' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_9, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "10' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_10, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "11' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_11, 
(SELECT SUM(DAm) AS 'Sum' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "12' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_sum_period_12, 

(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "01' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_1, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "02' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_2, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "03' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_3, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "04' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_4, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "05' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_5, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "06' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_6, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "07' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_7, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "08' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_8, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "09' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_9, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "10' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_10, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "11' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_11, 
(SELECT (((SUM(DAm)-(SUM(StcCst)*-1))*100)/NULLIF(SUM(DAm),0)) AS 'DG' FROM ProdTr WHERE AcYrPr = '" . $compared_year . "12' AND ProdTr.TrTp = 1 AND ProdTr.CustNo = '" . $customer . "') AS compared_dg_period_12 

FROM ProdTr 

WHERE AcYrPr LIKE 201612 
AND ProdTr.TrTp = 1 
AND ProdTr.CustNo = '" . $customer . "' 

GROUP BY ProdTr.CustNo, ProdTr.TrTp, ProdTr.AcYrPr

请注意，该查询效果很好，给我我期望的结果 - 但它对于有很多订单/交易的客户来说太慢了。

就如何加快这任何指针？

非常感谢您的时间！

来源

2017-03-26 Magnus Alexander

你看着GROUP BY？即使你不能在一个查询中运行整个事情，你也可以在四个地方完成，并将结果放入单个关联数组中。 – Nick

您的查询应该使用有条件聚集：

SELECT ProdTr.CustNo AS customernummer, 
     SUM(CASE WHEN AcYrPr = '" . $year . "01' THEN DAm ELSE 0 END) as sum_period_1, 
     SUM(CASE WHEN AcYrPr = '" . $year . "02' THEN DAm ELSE 0 END) as sum_period_2, 
     . . . 
WHERE AcYrPr LIKE 201612 AND ProdTr.TrTp = 1 AND 
     ProdTr.CustNo = '" . $customer . "' 
GROUP BY ProdTr.CustNo, ProdTr.TrTp;

子查询不应该是必要的。

来源

2017-03-26 21:53:18

谢谢！（SUM（StcCst）* - - 1））* 100）/ NULLIF从该组删除，ProdTr.AcYrPr当BY子句我可以问你怎么把（SELECT（（（SUM（DAM）这种运作良好（SUM（DAM），0））AS 'DG' FROM ProdTr WHERE AcYrPr =“”。$一年。 “01并ProdTr.TrTp = 1 AND ProdTr.CustNo =“”。$客户。“'）AS dg_period_1， CASE语法中？非常感谢！ –

@MagnusAlexander。。。我错过了那个在'group by'中。 –

不用担心:)非常感谢！ –

使SQL查询更快更好

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