Limit the result dataset

Hi Everyone, 

I have following postgreSQL - 

select
Name,
RollNumber,
Address,
ContanctNo,
Standard,
YearOfJoining,
from student
where YearOfJoining='?'
and Standard='?'
order by markes desc limit 5 

I need to show Name,RollNumber,Address,ContanctNo,Standard,YearOfJoining  on table visual. 

1) To do so I have imported the student from postGreSQL db and applied order by desc on markes column by applying transformation.

2) Now on top of ordered data (student table) , i have created slicer for YearOfJoining and Standard column.

3) After selecting desired value in slicer (YearOfJoining=2021 and Standard =12), i am getting too many rows in table visual , and now I have to select only 5 records.

I am not able to find any way so that I can filter only 5 records in final table visual.

NOTE : markes value is NULL as of now.

Please help.