Let's say you want to display the records from the left table which is the ENROL table  which are NOT IN the right table which is the SUBMIT table.
Tables:
       
|  | 
| STUDENT | 
|  | 
| ENROL | 
Query:
select * from student where stud_id NOT IN (select stud_id from enrol)
The output displays records of students that are not yet enrolled.
Output:

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