Sql Server：多行合并成一行，并做分组统计的两个方法
<div class="codetitle"><a style="CURSOR: pointer" data="82677" class="copybut" id="copybut82677" onclick="doCopy('code82677')"> 代码如下:
<div class="codebody" id="code82677">
--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XMLSELECT code,data=STUFF((SELECT ','+[values] FROM test t WHERE code=t1.code FOR XML PATH('')),1,''),sum([count]) as [count]
FROM test t1
GROUP BY code--
查询结果--001 aa,bb 3
--002 aaa,bbb,ccc 12drop table test
