sql server 将某一列的值拼成一个字符串 赋值到一个字段内

DECLARE @refCodeitems VARCHAR(800),

 

SELECT @refCodeitems=ISNULL(@refCodeitems,'')+refCodeitem +'/' from (SELECT refCodeitem from imatdocitem where DocCode ='XC00017802')
as t
SELECT @refCodeitems