-- https://docs.oracle.com/en/database/oracle/oracle-database/23/lnpls/plsql-triggers.html
CREATE TABLE emp (
  Empno     NUMBER NOT NULL,
  Ename     VARCHAR2(10),
  Job       VARCHAR2(9),
  Mgr       NUMBER(4),
  Hiredate  DATE,
  Sal       NUMBER(7,2),
  Comm      NUMBER(7,2),
  Deptno    NUMBER(2) NOT NULL);
CREATE TABLE dept (
  Deptno    NUMBER(2) NOT NULL,
  Dname     VARCHAR2(14),
  Loc       VARCHAR2(13),
  Mgr_no    NUMBER,
  Dept_type NUMBER);