SqlServer模仿Mysql函数Find_in_set,group_concat的功能

判断某个逗号隔开的字段中有某个值

FIND_IN_SET('a','a,b,c,d') 用 CHARINDEX(','+'b'+',' , ','+'a,b,c'+',') > 0 替代

模仿mysql的group_concat的示例

SELECT id,     
       val=( SELECT [value] +','     
               FROM tb AS b     
               WHERE b.id = a.id
               FOR XML PATH('')  )     
FROM tb AS a      
GROUP BY id

SELECT id,     
       [val]=STUFF( (SELECT ','+[value]     
                     FROM tb AS b     
                     WHERE b.id = a.id     
                     FOR XML PATH('')) , 1 , 1 , '' )    
FROM tb AS a      
GROUP BY id