order by and limit in sql code example

Example 1: sql limit order by

-- MySql
SELECT * FROM emp ORDER BY sal DESC LIMIT 5;	
-- SQL Server 
SELECT TOP 5 * FROM emp ORDER BY sal DESC;	
-- Oracle < 11g 
SELECT * FROM ( SELECT * FROM emp ORDER BY sal DESC ) WHERE ROWNUM <= 5;
-- Oracle 12c +
SELECT * FROM emp ORDER BY sal DESC FETCH FIRST 5 ROWS ONLY;

Example 2: sql limit order by

SELECT expressions
FROM tables
[WHERE conditions]
[ORDER BY expression [ ASC | DESC ]]
LIMIT number_rows [ OFFSET offset_value ];