1. 字段a 逗号拼接 无排序
listagg(a, ',') within group(order by null)
1. 字段a 逗号拼接 按a排序
listagg(a, ',') within group(order by a)
1. 字段a 逗号拼接 无排序
listagg(a, ',') within group(order by null)
1. 字段a 逗号拼接 按a排序
listagg(a, ',') within group(order by a)