我的PL / SQL函數怎么了？

Question

我得到錯誤：

ORA-06575: Package or function GET_CONC_NAMES is in an invalid state

當我嘗試通過以下方式調用get_conc_names函數時：

SELECT get_conc_names(EVENT_ID) FROM DT_EVENT_SERVICE;

函數本身：

CREATE OR REPLACE FUNCTION get_conc_names( p_event_id IN dt_event_service.event_id%type ) 
  RETURN VARCHAR2 
IS 
  l_conc_names VARCHAR2(32676);  
  -- You may want a smaller variable if you know the result will be smaller 
BEGIN 
  SELECT LTRIM(SYS_CONNECT_BY_PATH(name, ', '),',') conc_names 
    INTO l_conc_names 
    FROM ( 
      SELECT id, name, rownumber, cnt 
        FROM (SELECT es.EVENT_ID as id
                    ,s.SERVICE_NAME as name
                    ,ROW_NUMBER() OVER (order by name) as rownumber
                    ,COUNT(*) OVER () as cnt
                FROM DT_SERVICES s 
                     JOIN DT_EVENT_SERVICE es ON s.SERVICE_ID = es.SERVICE_ID 
               WHERE es.EVENT_ID = p_event_id ) 
             ) data 
    WHERE rownumber = cnt 
    START WITH rownumber = 1 
    CONNECT BY PRIOR rownumber = rownumber-1; 
  RETURN l_conc_names; 
END; 

編譯錯誤：

編譯失敗，行13（10:58:37）PL / SQL：ORA-00904：“名稱”：無效的標識符編譯失敗，行7（10:58:37）PL / SQL：忽略了SQL語句

Answer 1

錯誤的標識符可能在ROW_NUMBER() OVER (order by name)子句中。

CREATE OR REPLACE FUNCTION get_conc_names( p_event_id IN dt_event_service.event_id%type ) 
  RETURN VARCHAR2 
IS 
  l_conc_names VARCHAR2(32676);  
  -- You may want a smaller variable if you know the result will be smaller 
BEGIN 
  SELECT LTRIM(SYS_CONNECT_BY_PATH(name, ', '),',') conc_names 
    INTO l_conc_names 
    FROM ( 
      SELECT id, name, rownumber, cnt 
        FROM (SELECT es.EVENT_ID as id
                    ,s.SERVICE_NAME as name
                    ,ROW_NUMBER() OVER (order by s.SERVICE_NAME) as rownumber
                    ,COUNT(*) OVER () as cnt
                FROM DT_SERVICES s 
                     JOIN DT_EVENT_SERVICE es ON s.SERVICE_ID = es.SERVICE_ID 
               WHERE es.EVENT_ID = p_event_id ) 
             ) data 
    WHERE rownumber = cnt 
    START WITH rownumber = 1 
    CONNECT BY PRIOR rownumber = rownumber-1; 
  RETURN l_conc_names; 
END;