字符串聚合函数(去除重复值)

–功能:提供字符串的替代聚合函数 –说明:例如,将下列数据 –test_id test_value ——————– ‘a’ ‘01,03,04’ ‘a’ ‘02,04’ ‘b’ ‘03,04,08’ ‘b’ ‘06,08,09’ ‘c’ ’09’ ‘c’ ’10’ –转换成test_vlaue列聚合后的函数,且聚合后的字符串中的值不重复 –test_id test_value ——————– ‘a’ ‘01,03,04,02’ ‘b’ ‘03,04,08,06,09’ ‘c’ ‘09,10’ –代码——————————————-GO GO if object_id(N’dbo.merge’,N