Oracle 我在尝试在表中插入一行并创建了一个触发器后出现了这些错误

我发现以下错误：

INSERT INTO "DANIEL"."STATION" (NUM_STATION, NOM_STATION, ALTITUDE, REGION) 
VALUES ('6', 'Baalbak', '1250', 'Baalbek')
ORA-04091: table DANIEL.STATION is mutating, trigger/function may not see it
ORA-06512: at "DANIEL.TRUPDATE_HIST_STATION", line 5
ORA-04088: error during execution of trigger 'DANIEL.TRUPDATE_HIST_STATION'
ORA-06512: at line 1


One error saving changes to table "DANIEL"."STATION":
Row 6: ORA-04091: table DANIEL.STATION is mutating, trigger/function may not 
see it
ORA-06512: at "DANIEL.TRUPDATE_HIST_STATION", line 5
ORA-04088: error during execution of trigger 'DANIEL.TRUPDATE_HIST_STATION'
ORA-06512: at line 1

在表桩号中插入行后

这是我刚刚写的触发器代码：

create or replace TRIGGER trupdate_hist_station
  AFTER INSERT ON STATION
  FOR EACH ROW
DECLARE
  V_num_station NUMBER;
BEGIN
  BEGIN
    SELECT s.NUM_STATION
      INTO v_num_station
      FROM STATION s
      WHERE s.NUM_STATION = :NEW.NUM_STATION;
  EXCEPTION
    WHEN no_data_found THEN
      v_num_station :=0;
  END;

 INSERT INTO HIST_STATION
    ("NUM_STATION","ANNEE","NB_RESERV","REVENU")
  VALUES
    (V_num_station,(SELECT to_char(SYSDATE,'YYYY')FROM DUAL),0,0);
END trupdate_hist_station;

---

在Station表中添加一行后，我只需要在Hist_表中添加一行，无需从插入的表中选择任何内容（这就是导致突变的原因）

另外，去掉双引号，它们不是必需的，因为列名默认为大写

此外，不要

从
dual
-提取
SYSDATE
中选择
年份

这应该做到：

create or replace TRIGGER trupdate_hist_station
  AFTER INSERT ON STATION
  FOR EACH ROW
BEGIN
 INSERT INTO HIST_STATION  
    (num_station, annee, nb_reserv, revenu)
 VALUES
    (:new.num_station, extract (year from sysdate), 0, 0);
END trupdate_hist_station;