Sql ORACLE：带时间段的触发器

我有两张桌子：

-合同（经理、开始日期、结束日期、类别编号）

-团队（经理、开始日期、结束日期）

我想用触发器检查一下，当所有经理出现在团队中时，他们的合同类别是否在4到9之间

这是我的触发器：

CREATE TRIGGER T1
  BEFORE INSERT OR UPDATE OF manager on teams
  FOR EACH ROW
DECLARE
  nJP NUMBER;
  project_enddate DATE;
BEGIN
  SELECT sysdate INTO project_enddate FROM projects WHERE :NEW.end_date IS NULL;
  SELECT COUNT(*)
    INTO nJP
    FROM CONTRACTS c
    WHERE c.manager = :NEW.manager AND ((:NEW.start_date<c.start_date AND project_enddate>c.start_date) OR (:NEW.start_date>c.start_date)) AND c.cat_num BETWEEN 4 AND 9;
  IF nJP = 0 THEN
    RAISE_APPLICATION_ERROR(-20000,'Error: INVALID CAT_NUM');
  END IF;
END T1;
/

ERROR at line 1:
ORA-01403: no data found
ORA-06512: at "SYSTEM.DISP_CAT_SUP", line 5
ORA-04088: error during execution of trigger 'SYSTEM.DISP_CAT_SUP'

当我在团队中插入值（'12345'，截止日期（'05/02/15'，'DD-MM-YY'），截止日期（'29/03/16'，'DD-MM-YY'））

显示我的触发器的执行错误：

CREATE TRIGGER T1
  BEFORE INSERT OR UPDATE OF manager on teams
  FOR EACH ROW
DECLARE
  nJP NUMBER;
  project_enddate DATE;
BEGIN
  SELECT sysdate INTO project_enddate FROM projects WHERE :NEW.end_date IS NULL;
  SELECT COUNT(*)
    INTO nJP
    FROM CONTRACTS c
    WHERE c.manager = :NEW.manager AND ((:NEW.start_date<c.start_date AND project_enddate>c.start_date) OR (:NEW.start_date>c.start_date)) AND c.cat_num BETWEEN 4 AND 9;
  IF nJP = 0 THEN
    RAISE_APPLICATION_ERROR(-20000,'Error: INVALID CAT_NUM');
  END IF;
END T1;
/

ERROR at line 1:
ORA-01403: no data found
ORA-06512: at "SYSTEM.DISP_CAT_SUP", line 5
ORA-04088: error during execution of trigger 'SYSTEM.DISP_CAT_SUP'

---

告诉我们错误是什么会有帮助吗？将“从项目中选择sysdate到project_enddate，其中：NEW.end_date为NULL；”替换为“如果：NEW.end_date为NULL，那么project_enddate:=sysdate；end IF”。如果项目表中有>1行，则您将选择error@OldProgrammer我怀疑是ORA-01422。这是

系统。DISP\u CAT\u SUP

程序？错误似乎与您的特定触发器无关。您能否检查是否有任何其他触发器与此表关联

团队
？谢谢大家！！！我用TenG解决了我的问题评论：D