SQL逗号分隔行和Group By子句

I have the following query:

我有以下查询:

SELECT
  Account,
  Unit,
  SUM(state_fee),
  Code
FROM tblMta
WHERE MTA.Id = '123'
GROUP BY Account,Unit

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.

这当然会抛出异常，因为代码不在group by子句中。每个state_fee都有一个代码。如何将此代码显示在一个记录中(每个state_fee有一个代码，每个单元有多个state_fee)作为逗号分隔的列表?我在这里研究了不同的解决方案，但是我找不到任何与团队合作的方案。

3 个解决方案

#1

You want to use FOR XML PATH construct:

您希望将其用于XML路径构造:

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

See other examples here:

看到其他的例子:

SQL same unit between two tables needs order numbers in 1 cell
两个表之间的SQL相同单元需要一个单元格中的订单号
SQL Query to get aggregated result in comma seperators along with group by column in SQL Server
SQL查询，以逗号分隔符和SQL Server中的逐列分组来获取聚合结果

#2

There is no built-in aggregate function to concatenate, but this article discusses several alternative solutions, including a user-defined concatenate aggregate function:

没有内置的聚合函数来连接，但是本文讨论了几种可选的解决方案，包括用户定义的连接聚合函数:

https://www.simple-talk.com/sql/t-sql-programming/concatenating-row-values-in-transact-sql/

#3

This will show you the table, index name, index type, indexed columns, and included columns:

这将向您显示表、索引名称、索引类型、索引列以及包含的列:

with [indexes] (table_name, index_name, column_name, index_id, key_ordinal, object_id, type_desc)
as(
SELECT  distinct
  T.[name] AS [table_name], I.[name] AS [index_name], 
  AC.[name] AS [column_name],
  I.[index_id], IC.[key_ordinal], T.[object_id], i.type_desc
FROM sys.[tables] AS T  
  INNER JOIN sys.[indexes] I ON T.[object_id] = I.[object_id]  
  INNER JOIN sys.[index_columns] IC ON I.[object_id] = IC.[object_id]  and IC.index_id=I.index_id
  LEFT OUTER JOIN sys.[all_columns] AC ON T.[object_id] = AC.[object_id] AND IC.[column_id] = AC.[column_id] 
WHERE T.[is_ms_shipped] = 0 AND I.[type_desc] <> 'HEAP'
)
select
    distinct
    db_name() as dbname,
    type_desc,
    table_name,
    index_name,
    column_name,
    STUFF((
        select ', ' + column_name
        from [indexes] t2
        where t1.table_name=t2.table_name and t1.[index_name]=t2.[index_name] and t2.[key_ordinal] = 0
        for xml path('')), 1, 2, '') inc_cols
from [indexes] t1
where t1.[key_ordinal] = 1
GROUP BY table_name, index_name, type_desc, column_name

#1