在IF语句中使用SELECT

Question

我想要一个这样的查询：

 if ((select closedatetime from tbl_eventschedularmaster where eventid=p_EventId)> sysdate)
 then
     update tbL_ANSWERMASTER set AnsText=p_AnsText
      where AnsId=p_checkduplicate RETURNING AnsId INTO p_ReturnVal;
else 
      RETURNING 0 INTO p_ReturnVal;
 end if

但它不起作用

Answer 1

您需要重新编写

select closedatetime
  into dtClosedDateTime
  from tbl_eventschedularmaster
  where eventid = p_EventId;

if dtClosedDateTime > sysdate then
  update tbL_ANSWERMASTER
    set AnsText=p_AnsText
    where AnsId=p_checkduplicate
    RETURNING AnsId INTO p_ReturnVal;
else 
  p_ReturnVal := 0;
end if;

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