SQL语句：合并列值（将一列的多个值合并成一行）

Posted 2021-03-06 superfeeling

需求：

将一列的多个值合并成一行并用逗号分割

效果

sql语法：

mysql写法：

 --默认的逗号分隔
select GROUP_CONCAT(A.title) as citys from tmpcity A;     

 --用空格分隔
select GROUP_CONCAT(A.title SEPARATOR  ‘ ‘) as citys from tmpcity A; 

oralce写法：

select WM_CONCAT(A.title) as citys from tmpcity A

sql server写法：

select stuff((select ‘,‘+A.title from tmpCity A FOR xml PATH(‘‘)), 1, 1, ‘‘) as citys