listagg数据库链接问题

Question

对于以下查询，我只收到错误：

  

ORA-00923：在DBLINK中找不到FROM关键字。

select LISTAGG(SERVICE_ORDER, ', ')  WITHIN GROUP (ORDER BY SERVICE_ORDER) 
"service_order"
FROM TBL_DATA@TBL_REP

Answer 1

也适用于12c（12.1.0.2.0）：

SELECT LISTAGG (SERVICE_ORDER, ', ') WITHIN GROUP (ORDER BY SERVICE_ORDER)
           "service_order"
  FROM (SELECT 'a' SERVICE_ORDER FROM DUAL
        UNION ALL
        SELECT 'b' SERVICE_ORDER FROM DUAL
        UNION ALL
        SELECT 'c' SERVICE_ORDER FROM DUAL)