需要在SQL查询

Question

我有一个SQL表输出：

PLAN_CD PLAN_NM CLASS 
D01501 DENTAL AA 
D01501 DENTAL AB 
D01501 DENTAL AC 
V01501 VISION AA 
V01501 VISION AB 

输出应该是：

PLAN_CD PLAN_NM 
D01501 DENTAL,AA,AB,AC 
V01501 VISION,AA,AB 

Answer 1

以下2个问题可以帮助你：

How to use GROUP BY to concatenate strings in SQL Server?

GROUP BY to combine/concat a column

看一看。

Answer 2

在MSSQL 2005和最多可以这样做：

select * into #data 
from (
    select 'D01501' as PLAN_CD, 'DENTAL' as PLAN_NM, 'AA' as CLASS union 
    select 'D01501', 'DENTAL', 'AB' union 
    select 'D01501', 'DENTAL', 'AC' union 
    select 'V01501', 'VISION', 'AA' union 
    select 'V01501', 'VISION', 'AB' 
) x 


select R.PLAN_CD, PLAN_NM = R.PLAN_NM + ',' + 
STUFF((
    SELECT ',' + [CLASS] 
    FROM #data 
    WHERE (PLAN_CD = R.PLAN_CD and PLAN_NM = R.PLAN_NM) 
    FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)') 
    ,1,1,'') 

from 
#data R 
group by R.PLAN_CD, R.PLAN_NM 

这将组对PLAN_CD和PLAN_NM领域，与子查询选择拼接CLASS域。连接使用FOR XML结构完成。