Sql Server:多行合并成一行,并做分組統計的兩個方法

Sql Server:多行合并成一行,并做分組統計的兩個方法,需要的朋友可以參考一下

代碼如下:
–創建 test 表 ,插入數據

CREATE TABLE test(code varchar(50), [values] varchar(10),[count] int)
INSERT test select ‘001’, ‘aa’,1
UNION ALL SELECT ‘001’, ‘bb’,2
UNION ALL SELECT ‘002’, ‘aaa’,4
UNION ALL SELECT ‘002’, ‘bbb’,5
UNION ALL SELECT ‘002’, ‘ccc’,3;

–方法一
–將多行合并成一行,并做分組統計
SELECT code,
[values] =
stuff(b.[values].value(‘/R[1]’, ‘nvarchar(max)’),
,
,
”),[count]
FROM (SELECT code,sum([count]) as [count]
FROM test
GROUP BY code) a
CROSS apply (
SELECT [values] =(
SELECT N’,’ + [values] FROM test
WHERE code = a.code
FOR XML PATH(”), ROOT(‘R’), TYPE
)
) b;

–方法二

—SQL2005中的新解法 使用XML

SELECT code, data=STUFF((SELECT ‘,’+[values] FROM test t WHERE code=t1.code FOR XML PATH(”)), 1, 1, ”),sum([count]) as [count]
FROM test t1
GROUP BY code

–查詢結果

–001 aa,bb 3
–002 aaa,bbb,ccc 12

drop table test

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