Alternate of sql server TOP in oracle

问题

How to get top 3 records in oracle pl sql?i am new to oracle,earlier i have used sql server.

My requirement is to get distinct top 3 records of Column X.

回答1:

Try this to retrieve the Top N records from a query, you can use the following syntax::-

 SELECT *
 FROM (your ordered query) alias_name
 WHERE rownum <= Rows_to_return

Example:-

SELECT *
 FROM (select * from suppliers ORDER BY supplier_name) suppliers2
 WHERE rownum <= 3

回答2:

This may help you

SELECT ename, sal 
  FROM ( SELECT ename, sal, RANK() OVER (ORDER BY sal DESC) sal_rank
           FROM emp ) 
 WHERE sal_rank <= 3;

来源：https://stackoverflow.com/questions/13667845/alternate-of-sql-server-top-in-oracle