text: create table dept (
      dept_id int,
      dept_name VARCHAR(255),
      dept_area VARCHAR(255)
  );
  
  insert into dept (dept_id, dept_name, dept_area) values
      (10,"system","tokyo"),
      (20,"system","osaka"),
      (30,"sales","LA"),
      (40,"edu","tokyo"),
      (50,"develop","nagoya");
  
  Create table emp(
      emp_id int,
      emp_name VARCHAR(255),
      dept_id int
      );
  
  insert into emp values
      (101,"sato keiji",10),
      (102,"suzuki kenichi",40),
      (103,"mikami hideki",40),
      (104,"aoki tomio",20);
  