what is the output of step 4,5 and 6? explain why the results make sense or do not make sense

instructions:

question:

Preliminary - Create the following three tables CREATE TABLE table1 (a int primary key, b int) CREATE TABLE table2 (a int primary key, b int); Open two terminals (e.g. putty or XShell) and login Oracle database . Assume that each terminal represents each individual user (i.e. User1 and User2)