SQL SERVER STUFF FUNCTION SCENARIO

Posted 2021-04-05

在SQL Server中，我有一个这样的表：

Col-1    Col-2    Col-3
------------------------
A         123     25.13
A         456     67.00
A         789     81.89

我想要这样的输出：

Col-1      Col-2            Col-3
-----------------------------------
A         123,456,789      174.02

答案

你可以使用FOR XML子句与STUFF()函数：

select co1, stuff( (select distinct ','+cast(t1.col2 as varchar(255)) 
                    from table t1 
                    where t1.col1 = t.col1
                    for xml path('')
                    ), 1, 1, ''
                 ) as col2, 
       sum(col3)
from table t
group by co1;

另一答案

样本数据 ：

DECLARE @T TABLE(Col1 VARCHAR(1),
                 Col2 INT,
                 Col3 FLOAT)

INSERT INTO @T( Col1, Col2, Col3 )
VALUES  ('A',123,25.13),('A',456,67),('A',789,81.89)

查询：

;WITH Keys AS (SELECT Col1,
                      SUM(Col3) AS Col3
               FROM @T 
               GROUP BY Col1)
SELECT Keys.Col1,
       REPLACE(REPLACE(REPLACE( CONVERT (NVARCHAR(MAX),(SELECT T.Col2 AS A
        FROM @T AS T 
        WHERE T.Col1 = Keys.Col1
        FOR XML PATH(''))),'</A><A>',','),'<A>',''),'</A>','') AS Col2,

        Keys.Col3
FROM Keys

结果：

Col1    Col2          Col3
A       123,456,789   174.02