使用 SQL Server UNION ALL 时，我可以合并列吗？答案

【问题标题】：When using SQL Server UNION ALL, can I merge columns?使用 SQL Server UNION ALL 时，我可以合并列吗？
【发布时间】：2014-06-24 13:00:32
【问题描述】：

我在 SQL Server 中有两个表。

表 1：JBIN：所有发票的列表。
表 2：ARTH：所有已批准发票的列表。

我创建了一个查询，显示发票逾期天数的信息。

结果表如下所示：

+-----------------------+--------------+--------------+------+
|     OverdueRange      | OverdueCount | Total Amount | INVO |
+-----------------------+--------------+--------------+------+
| Due in 0-7 days       |            1 | 180215.61    |   -1 |
| Due in 31-45 days     |            1 | 153356.10    |  -32 |
| Overdue by 46+ days   |            1 | 125167.34    |   47 |
| Due in 0-7 days       |           25 | 2708613.25   |   -1 |
| Due in 31-45 days     |            3 | 62312.51     |  -32 |
| Overdue by 15-30 days |           12 | 295140.15    |   16 |
| Overdue by 1-7 days   |            1 | 111070.25    |    2 |
| Overdue by 31-45 days |            1 | 2150.50      |   32 |
| Overdue by 46+ days   |            8 | 546907.75    |   47 |
| Overdue by 8-14 days  |            1 | 156985.68    |    9 |
+-----------------------+--------------+--------------+------+

在这个查询中，我有一个UNION ALL 语句。

表格的前三行来自JBIN，其余的来自ARTH。

是否可以，当使用UNION ALL 合并数据时。例如，我没有两行称为“0-7 天内到期，而是有一行对 OverdueCount 和 Total Amount 字段求和。

例如

而不是这个：

+-----------------+--------------+--------------+------+
|  OverdueRange   | OverdueCount | Total Amount | INVO |
+-----------------+--------------+--------------+------+
| Due in 0-7 days |            1 | 180215.61    |   -1 |
| Due in 0-7 days |           25 | 2708613.25   |   -1 |
+-----------------+--------------+--------------+------+

我想要这个：

+-----------------+--------------+--------------+------+
|  OverdueRange   | OverdueCount | Total Amount | INVO |
+-----------------+--------------+--------------+------+
| Due in 0-7 days |           26 | 2888828.86   |   -1 |
+-----------------+--------------+--------------+------+

仅供参考：

这是我的查询：

WITH Temp ([InvDescription], [InvoiceAmount], [OverdueBy], [DatePaid])
AS 
(select InvDescription, InvTotal as InvoiceAmount, (DATEDIFF(day,DueDate,GETDATE())) as OverdueBy, NULL as DatePaid from JBIN
Where InvStatus <> 'I' and JBCo = 1 and InvTotal > 0 

),
Temp2 ([InvDescription], [InvoiceAmount], [OverdueBy], [DatePaid])
AS 
(select Description, SUM(Invoiced) as InvoiceAmount, (DATEDIFF(day,DueDate,GETDATE())) as OverdueBy, PayFullDate as DatePaid from ARTH
Where ARCo = 1 and Invoiced > 0 
Group By Description, DueDate, PayFullDate, Invoice
)
SELECT 
   CASE WHEN OverdueBy >= 46 THEN 'Overdue by 46+ days' 
        WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN 'Overdue by 31-45 days'
        WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN 'Overdue by 15-30 days'
        WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN 'Overdue by 8-14 days'
        WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN 'Overdue by 1-7 days'
        WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN 'Due in 0-7 days'
        WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN 'Due in 8-14 days'
        WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN 'Due in 15-30 days'
        WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN 'Due in 31-45 days'
        WHEN OverdueBy <= -46 THEN 'Due in 46+ days'
        ELSE 'Less than that' 
   END AS OverdueRange,
   Count(*) as OverdueCount,
   Sum(Temp.InvoiceAmount) as [Total Amount], 
   CASE WHEN OverdueBy >= 46 THEN '47' 
        WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN '32'
        WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN '16'
        WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN '9'
        WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN '2'
        WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN '-1'
        WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN '-9'
        WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN '-16'
        WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN '-32'
        WHEN OverdueBy <= -46 THEN '-47'
        ELSE 'ERROR' 
   END AS [INVO]
From Temp
group by CASE WHEN OverdueBy >= 46 THEN 'Overdue by 46+ days' 
            WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN 'Overdue by 31-45 days'
            WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN 'Overdue by 15-30 days'
            WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN 'Overdue by 8-14 days'
            WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN 'Overdue by 1-7 days'
            WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN 'Due in 0-7 days'
            WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN 'Due in 8-14 days'
            WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN 'Due in 15-30 days'
            WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN 'Due in 31-45 days'
            WHEN OverdueBy <= -46 THEN 'Due in 46+ days'

ELSE 'Less than that' END,
CASE WHEN OverdueBy >= 46 THEN '47' 
            WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN '32'
            WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN '16'
            WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN '9'
            WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN '2'
            WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN '-1'
            WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN '-9'
            WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN '-16'
            WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN '-32'
            WHEN OverdueBy <= -46 THEN '-47'
ELSE 'ERROR' END
UNION ALL 

SELECT CASE WHEN OverdueBy >= 46 THEN 'Overdue by 46+ days' 
            WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN 'Overdue by 31-45 days'
            WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN 'Overdue by 15-30 days'
            WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN 'Overdue by 8-14 days'
            WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN 'Overdue by 1-7 days'
            WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN 'Due in 0-7 days'
            WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN 'Due in 8-14 days'
            WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN 'Due in 15-30 days'
            WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN 'Due in 31-45 days'
            WHEN OverdueBy <= -46 THEN 'Due in 46+ days'
ELSE 'Less than that' END AS OverdueRange,
Count(*) as OverdueCount,
Sum(Temp2.InvoiceAmount) as [Total Amount], 
CASE WHEN OverdueBy >= 46 THEN '47' 
            WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN '32'
            WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN '16'
            WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN '9'
            WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN '2'
            WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN '-1'
            WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN '-9'
            WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN '-16'
            WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN '-32'
            WHEN OverdueBy <= -46 THEN '-47'
ELSE 'ERROR' END AS [INVO]
From Temp2
Where Temp2.DatePaid is null

group by CASE WHEN OverdueBy >= 46 THEN 'Overdue by 46+ days' 
            WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN 'Overdue by 31-45 days'
            WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN 'Overdue by 15-30 days'
            WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN 'Overdue by 8-14 days'
            WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN 'Overdue by 1-7 days'
            WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN 'Due in 0-7 days'
            WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN 'Due in 8-14 days'
            WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN 'Due in 15-30 days'
            WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN 'Due in 31-45 days'
            WHEN OverdueBy <= -46 THEN 'Due in 46+ days'

ELSE 'Less than that' END,
CASE WHEN OverdueBy >= 46 THEN '47' 
            WHEN OverdueBy >= 31 and OverdueBy <= 45 THEN '32'
            WHEN OverdueBy >= 15 and OverdueBy <= 30 THEN '16'
            WHEN OverdueBy >= 8 and OverdueBy <= 14 THEN '9'
            WHEN OverdueBy >= 1 and OverdueBy <= 7 THEN '2'
            WHEN OverdueBy <= 0 and OverdueBy >= -7 THEN '-1'
            WHEN OverdueBy <= -8 and OverdueBy >= -14 THEN '-9'
            WHEN OverdueBy <= -15 and OverdueBy >= -30 THEN '-16'
            WHEN OverdueBy <= -31 and OverdueBy >= -45 THEN '-32'
            WHEN OverdueBy <= -46 THEN '-47'
ELSE 'ERROR' END

【问题讨论】：

为什么不再添加一个 CTE，并在 CTE 查询中将过期（...过期 31-45 天...）值分配为新列
我相信你的问题不是如何合并列而是如何合并行。

标签： sql sql-server sum union-all

【解决方案1】：

您可以从 union all 查询创建派生表。像这样的：

select somefields, sum(something) thesum
from (
union all query goes here
) derivedTable
group by somefields

【讨论】：

有没有机会说得更具体些？我试过这个，但我认为我做错了。
您问题中的查询非常复杂，可能比必要的还要多。从简单的事情开始，然后建立起来。