SQL Server 2014中的表中需要逗号分隔值[重复]

Question

我有一张这样的桌子。

Create table #temp
(
    id int,
    firstname varchar(50),
    lastname varchar(50)
)

insert into #temp (id, firstname, lastname)
select 1,'mit','jain'

insert into #temp (id, firstname, lastname)
select 1,'mit','jain1'

insert into #temp (id, firstname, lastname)
select 1,'mit','jain2'

insert into #temp (id, firstname, lastname)
select 2,'mit','jain3'

insert into #temp (id, firstname, lastname)
select 2,'mit','jain4'

insert into #temp (id, firstname, lastname)
select 1,'mit','jain5'

insert into #temp (id, firstname, lastname)
select 1,'mit','jain6'

我希望表格如下所示

id  firstname  lastname
----------------------------------------------
 1   mit        jain,jain1,jain2,jain5,jain6 
 2   mit        jain2,jain4

我试过如下查询

select  
    id, firstname,
    substring((Select ', '+tc1.lastname AS [text()]
               From #temp tc1
               Inner Join #temp c1 On c1.id = tc1.id
               Where tc1.firstname = c1.firstname
               Order BY tc1.lastname
               For Xml Path('')), 2, 1000) 'LastName1' 
from #temp 
group by id, firstname

但它不起作用。请帮帮我

Answer 1

你是其中的一部分。传统方法是使用STUFF：

SELECT t.id, t.firstname,
       STUFF((SELECT ', ' + sq.lastname
              FROM #temp sq
              WHERE sq.id = t.id
                AND sq.firstname = t.firstname
              ORDER BY sq.lastname
              FOR XML PATH('')),1,1,'') AS lastname
FROM #temp t
GROUP BY t.id, t.firstname;

关于如何做到这一点已经有很多关于 SO 的答案，但你已经表现出努力。 :)