Sql Server:多行合并成一行,并做分组统计
--创建 test 表 ,插入数据
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
--将多行合并成一行,并做分组统计
SELECT code,
[values] =
stuff(b.[values].value('/R[1]', 'nvarchar(max)'),
1,
1,
''),[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
--查询结果
--001 aa,bb 3
--002 aaa,bbb,ccc 12
drop table test
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
--将多行合并成一行,并做分组统计
SELECT code,
[values] =
stuff(b.[values].value('/R[1]', 'nvarchar(max)'),
1,
1,
''),[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
--查询结果
--001 aa,bb 3
--002 aaa,bbb,ccc 12
drop table test
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