我在MS SQL Server中有2个表。
表1
ID Name
-------------
10 Series
11 Movie
12 Music
13 Other
表2
ID IDCatg Value
---------------------------
1 10 Hannibal
2 10 Blacklist
3 10 POI
4 11 Hitman
5 11 SAW
6 11 Spider man
7 12 taylor swift
8 12 britney spears
我想通过表2中的IDCatg进行选择,并在表1中创建一个新列,如下所示:
IDCatg Name Value
--------------------------------------------
10 Series Hannibal-Blacklist-POI
11 Movie Hitman-SAW-Spider man
12 Music taylor swift-britney spears
我如何通过观看来做到这一点?
答案 0 :(得分:2)
您可以使用STUFF
执行此操作:
SELECT T21.IDCatg, T1.Name,
[Value] = STUFF((
SELECT '-' + T22.[Value]
FROM Table2 T22
WHERE T21.IDCatg = T22.IDCatg
FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 1, '')
FROM Table2 T21 JOIN
Table1 T1 ON T1.ID=T21.IDCatg
GROUP BY T21.IDCatg,T1.Name
结果:
IDCatg Name Value
---------------------------------------------
10 Series Hannibal-Blacklist-POI
11 Movie Hitman-SAW-Spider man
12 Music taylor swift-britney spears
中的示例结果
修改强>
当Value
的类型为int时,您可以将其强制转换为varchar:
[Value] = STUFF((
SELECT '-' + CAST(T22.[Value] AS Varchar(MAX))