Question

我有一个查询，其代码如下所示：

SELECT DocumentID, ComplexSubquery1 ... ComplexSubquery5
FROM   Document
WHERE  ...

ComplexSubquery是使用duh复杂子查询计算的所有数字字段。

我想将此查询用作查询的子查询，该查询生成如下所示的摘要：

   Field          DocumentCount           Total
     1                 dc1                 s1
     2                 dc2                 s2
     3                 dc3                 s3
     4                 dc4                 s4
     5                 dc5                 s5

其中：

dc<n> = SUM(CASE WHEN ComplexSubquery<n> > 0 THEN 1                  END)
s <n> = SUM(CASE WHEN Field = n              THEN ComplexSubquery<n> END)

我怎么能在SQL Server中这样做？

注意：我知道我可以通过放弃原始查询和使用工会来避免此问题：

SELECT '1' AS TypeID,
       SUM(CASE WHEN ComplexSubquery1 > 0 THEN 1 END) AS DocumentCount
       SUM(ComplexSubquery1)                          AS Total
FROM   (SELECT DocumentID, BLARGH ... AS ComplexSubquery1) T
UNION ALL
SELECT '2' AS TypeID,
       SUM(CASE WHEN ComplexSubquery2 > 0 THEN 1 END) AS DocumentCount
       SUM(ComplexSubquery2)                          AS Total
FROM   (SELECT DocumentID, BLARGH ... AS ComplexSubquery2) T
UNION ALL
...

但我想避开这条路线，因为多余的代码让我的眼睛流血。（此外，复杂子查询的数量很有可能在未来增长。）

Answer 1

WITH Document(DocumentID, Field) As
(
SELECT 1, 1 union all
SELECT 2, 1 union all
SELECT 3, 2 union all
SELECT 4, 3 union all
SELECT 5, 4 union all
SELECT 6, 5 union all
SELECT 7, 5
), CTE AS
(
SELECT DocumentID, 
       Field, 
       (select 10) As ComplexSubquery1,  
       (select 20) as ComplexSubquery2,
       (select 30) As ComplexSubquery3,  
       (select 40) as ComplexSubquery4,
       (select 50) as ComplexSubquery5
FROM   Document
)
SELECT Field, 
       SUM(CASE WHEN RIGHT(Query,1) = Field AND QueryValue  > 1 THEN 1 END ) AS DocumentCount,
       SUM(CASE WHEN RIGHT(Query,1) = Field THEN QueryValue END ) AS Total
FROM CTE
UNPIVOT  (QueryValue FOR Query IN 
      (ComplexSubquery1, ComplexSubquery2, ComplexSubquery3, 
       ComplexSubquery4, ComplexSubquery5)
)AS unpvt
GROUP BY Field

返回

Field       DocumentCount Total
----------- ------------- -----------
1           2             20
2           1             20
3           1             30
4           1             40
5           2             100

Answer 2

我不是100％肯定你的例子，但也许PIVOT运算符可以帮助你在这里？我想如果您将原始查询选择到临时表中，您可以转移文档ID并获取其他查询的总和。

我对它没有多少经验，所以我不确定你的子查询有多复杂 - 你可能要把它分解。

如何将记录集列转换为行

2 个答案: