带Group By子句的SQL逗号分隔行
问题描述：
我有以下查询：
SELECT
Account,
Unit,
SUM(state_fee),
Code
FROM tblMta
WHERE MTA.Id = '123'
GROUP BY Account,Unit
这当然会引发异常，因为代码不在 group by 子句中。每个state_fee都有一个代码。如何获取此代码以逗号分隔的列表形式显示在1条记录中（每个state_fee 1个代码，每个单位有多个state_fee）？我在这里研究了不同的解决方案，但找不到与 group by 一起工作的任何解决方案。
This of course throws an exception because the Code is not in the group by clause. Each state_fee has a code. How do I get this code to display in 1 record (1 code per state_fee which is multiple state_fee per unit) as a comma-separated list? I looked into different solutions on here but I couldn't find any that worked with a group by.
答
您要使用 FOR XML PATH 构造：
SELECT ACCOUNT,
unit,
SUM(state_fee),
Stuff((SELECT ', ' + code
FROM tblmta t2
WHERE t2.ACCOUNT = t1.ACCOUNT
AND t2.unit = t1.unit
AND t2.id = '123'
FOR XML PATH('')), 1, 2, '') [Codes]
FROM tblmta t1
WHERE t1.id = '123'
GROUP BY ACCOUNT,
unit
在此处查看其他示例：
- SQL same unit between two tables needs order numbers in 1 cell
- SQL Query to get aggregated result in comma seperators along with group by column in SQL Server