为每个不同的名称值连接不同的姓氏值

Question

我想要实现的是为每个 DISTINCT 名称值连接所有 DISTINCT 姓氏值。

我所管理的是 DISTINCT 名称值的串联，但不幸的是所有姓氏值。

下面是我的代码：

SELECT DISTINCT ST2.[Name], 
    SUBSTRING(
        (
            SELECT ','+ST1.Surname  AS [text()]
            FROM [Ext_Names] ST1
            WHERE ST1.[Name] = ST2.[Name]
            ORDER BY ST1.[Name]
            FOR XML PATH ('')
        ), 2, 1000) [Surname]
FROM [Ext_Names] ST2

示例数据

结果

期望输出

Answer 1

您需要先 select 不同的值，然后聚合。如果你是运行 SQL Server 2017 或更高版本，你可以使用 string_agg():

select name, string_agg(surname, ',') within group (order by surname) surnames
from (select distinct name, surname from ext_names) t
group by name

Answer 2

你可以完成这个。

SELECT DISTINCT ST2.[Name], SUBSTRING((SELECT  ','+ T.Surename  AS [text()] FROM (SELECT DISTINCT ST1.Surename FROM Ext_Names ST1 WHERE ST1.Name = ST2.Name  ) T ORDER BY T.Surename FOR XML PATH('')),2,1000) [SureEname]
FROM Ext_Names ST2

为每个不同的名称值连接不同的姓氏值

Concatenate distinct surname values for each distinct name value

tsql

sql-server

string

group-by

distinct