text: insert into user values (10002, sysdate(), 'Bernard');
  insert into user values (20003, sysdate(), 'Thomas');
  insert into user values (30004, sysdate(), 'Tania');
  insert into user values (40005, sysdate(), 'Mark');
  insert into user values (50006, sysdate(), 'Sarah');
  insert into user values (60007, sysdate(), 'Joerg');
  
  insert into post values (1001, 'The First Post from Bernard', 10002);
  insert into post values (1002, 'The First Post from Thomas', 20003);
  insert into post values (1003, 'The First Post from Tania', 30004);
  insert into post values (1004, 'The First Post from Mark', 40005);
  insert into post values (1005, 'The First Post from Sarah', 50006);
  