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
