--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)'),
,
,
''),[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=https://www.it610.com/article/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
--001aa,bb3
--002aaa,bbb,ccc12
drop table test
