sql - IF 语句而不是选择

Question

在Informix 中它可以工作，在Oracle 中如何做到这一点？

IF (uzel NOT IN (SELECT a.uzel FROM user_setup.menu a WHERE a.vetka <> a.uzel
                             AND a.vetka IN (SELECT vetka FROM user_setup.param_menu)))
          THEN
             --;
          END IF;

Answer 1

尝试这个:

DECLARE
  temp NUMBER;
  v_uzel user_setup.menu.uzel%TYPE;
BEGIN    
  SELECT COUNT(*) 
  INTO temp
  FROM dual
  WHERE EXISTS (SELECT A.uzel 
                FROM user_setup.menu A 
                WHERE A.vetka <> A.uzel
                AND A.uzel = v_uzel
                AND A.vetka IN (SELECT vetka FROM user_setup.param_menu));


  IF temp < 1 THEN
    -- code here 

  END IF;
END;