if条件下是否允许子查询

Question

正确代码

"BEGIN 
    FOR ievt IN (
        SELECT 
            evt_udfchar06,evt_code,evt_enteredby 
        FROM 
            r5events 
        WHERE rowid       = :rowid ) LOOP 
        
        IF o7sess.cur_user = 'R5' AND ievt.evt_udfchar06 (SELECT evt_udfchar06 FROM r5events WHERE rowid <>:rowid) THEN 
            RAISE_APPLICATION_ERROR(-20004,''Incident number is associated with other WO.''); 
        END IF; 
        --o7sess.cur_user; 
    END LOOP; 
END;" 

PLS-00405: subquery not allowed in this context

if 条件是否允许子查询

Answer 1

if 条件是否允许子查询

没有。

无论使用：

• SELECT ... INTO ...

  在

  IF

  语句之前；或

• 检查光标中的其他行：

  BEGIN 
    FOR ievt IN (
      SELECT *
      FROM   (
        SELECT evt_udfchar06,
               evt_code,
               evt_enteredby,
               COUNT(*) OVER (PARTITION BY evt_udfchar06) AS num_rows
       FROM    r5events
     )
     WHERE  rowid = :rowid
   ) LOOP 
     IF o7sess.cur_user = 'R5'
        AND ievt.num_rows > 1
     THEN 
       RAISE_APPLICATION_ERROR(-20004,'Incident number is associated with other WO.'); 
     END IF; 
     --o7sess.cur_user; 
    END LOOP; 
  END;