If you want to Fetch limited numbers of rows from a table in oracle you can use Rownum.
Or in other words we can say that
It is  used to return specific number of rows in a query, we can use ROWNUM in Oracle and LIMIT in MySql. 
ROWNUM Syntax for Oracle:
1) SELECT col_name(s) 
2) FROM tablename
3) WHERE rownum<=number ;
Example:
If we have to return only first four employee names then the query will be:
SELECT  emp_names 
FROM Employee
WHERE rownum<=4;
It will return the first four records(emp_names) from Employee table.
                       
                    
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