top

1. Oracle數據庫  

SELECT * FROM TABLE1 WHERE ROWNUM<=N

2.DB2數據庫

 SELECT * ROW_NUMBER() OVER(ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM<=N

3.MySQL數據庫

 SELECT * FROM TABLE1 LIMIT N

3.SQL Server數據庫

 
SELECT TOP N * FROM TABLE1