[英]How to join the columns value in one column?
我有一个具有两列关系类型的表,并且与以下内容类似,我希望所有关系类型值在其中一列中的生命中都带有“ T”
+------------+---------+
|relationship|liveswith|
+------------+---------+
|A |T |
+------------+---------+
|B |T |
+------------+---------+
|C |F |
+------------+---------+
像这样
+------------+---------+
|T |F |
+------------+---------+
|A B |C |
+------------+---------+
我尝试使用Pivot,但在T列中只给了我一个值。 我正在使用Microsoft SQL Server 2012
您可以使用xml path('')并按如下方式使用STUFF
create table data(relationship varchar(10),liveswith varchar(10));
insert into data values('A','T');
insert into data values('B','T');
insert into data values('C','F');
with temp_output
as (
SELECT a.liveswith
,STUFF((SELECT '-' + relationship
FROM data a1
WHERE a1.liveswith=a.liveswith
ORDER BY relationship
FOR XML PATH('')), 1, 1, '') AS listStr
FROM data a
GROUP BY a.liveswith
)
select max(case when liveswith='T' then liststr end) as 'T'
,max(case when liveswith='F' then liststr end) as 'F'
from temp_output
+-----+---+
| T | F |
+-----+---+
| A-B | C |
+-----+---+
您可以使用case语句确定对错:
SELECT
string_agg(CASE WHEN liveswith THEN relationship ELSE '' END, ' ') AS T,
string_agg(CASE WHEN NOT liveswith THEN relationship ELSE '' END, ' ') AS F
FROM foobar;
输出:
t | f
------+-----
A B | C
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