text: CREATE DATABASE IF NOT EXISTS tempdb;
  SHOW DATABASES;
  CREATE TABLE IF NOT EXISTS Persons (
      ID int NOT NULL,
      LastName varchar(255) NOT NULL,
      FirstName varchar(255),
      Age int,
      PRIMARY KEY (ID)
  ); 
  
  CREATE TABLE IF NOT EXISTS Orders (
      OrderID int NOT NULL,
      OrderNumber int NOT NULL,
      PersonID int,
      PRIMARY KEY (OrderID),
      FOREIGN KEY (PersonID) REFERENCES Persons(ID)
  ); 
  