Question

想象一下，我们有一个表格，如：

Number Value GroupValue
1      FOO    GR1
22     BAR    GR2
100    FOO3   GR1
20     BAR23  GR2

我想根据组值获取这些行的总和值，但是，我想看看它在另一列中分组的行，例如：

SUM  values groups
101  FOO,FOO3 GR1
42   BAR,BAR23 GR2

我如何在sql中实现这一目标？

尝试：

> SELECT  SUM(ID) AS SUM ,
        STUFF(( SELECT  ',' + A
                FROM    dbo.Table_1 AS T2
                WHERE   A = T2.A
              FOR
                XML PATH('')
              ), 1, 1, '') AS A ,
        B
FROM    dbo.Table_1 AS T
GROUP BY B ,
        A

但这无法正确处理这些群体......

Answer 1

您无法使用SELECT中GROUP BY列表中创建的别名。您可以通过将列表与聚合（cte / subquery）分开来解决此问题：

WITH cte AS (SELECT  *
                     ,STUFF(( SELECT  ',' + Value
                              FROM    Table1 AS T2
                              WHERE   T.GroupValue = T2.GroupValue
                              FOR XML PATH('')
                            ), 1, 1, '') AS Value_List
              FROM    Table1 AS T)
SELECT  SUM(Number) AS Total
       ,Value_List
       ,GroupValue
FROM cte
GROUP BY Value_List, GroupValue

演示：SQL Fiddle

或者您可以使用分区SUM()（窗口函数）：

SELECT  DISTINCT SUM(Number) OVER(PARTITION BY GroupValue) AS Total
        ,STUFF(( SELECT  ',' + Value
                 FROM    Table1 AS T2
                 WHERE   T.GroupValue = T2.GroupValue
                 FOR XML PATH('')
               ), 1, 1, '') AS Value_List
        ,GroupValue
FROM    Table1 AS T

演示：SQL Fiddle

Answer 2

您只需进行一些小改动，将您的SQL 不带组合到该组的另一个选择中。我认为我正确地转换了你的SQL：

SELECT SUM(ID) as IdSum, B FROM (
SELECT  ID,
        STUFF(( SELECT  ',' + A
                FROM    dbo.Table_1 AS T2
                WHERE   A = T2.A
              FOR
                XML PATH('')
              ), 1, 1, '') AS B
FROM    dbo.Table_1 AS T) AS B2
GROUP BY B

Answer 3

您可以将列表深度嵌套一层

...

SELECT
    IDList1=    
        SUBSTRING((
            SELECT  ', ' + CAST(TargetID AS NVARCHAR(10))
            FROM 
            (
                SELECT 
                   DISTINCT TargetID 
                FROM 
                   TargetTable 
                WHERE 
                  TargetIDTableField2=MAINQUERYALIAS.TargetIDTableField2
            )
            AS UP2
            ORDER BY 
             TargetID FOR XML PATH( '' )
        ), 3, 1000 )
FROM
(
   ...
) AS MAINQUERYALIAS

Answer 4

下载并运行此脚本http://groupconcat.codeplex.com/releases/view/106409 你可以像解决这个问题一样解决你的问题

select SUM(Number), dbo.GROUP_CONCAT(Value)
from Table_2 
group by GroupValue

如果这个回答你的问题，请标记为已回答

使用group by和aggregate函数连接行

4 个答案: