Select Top在不同数据库中的使用方法：
1. Oracle数据库 (ORACLE不支持SELECT TOP语句，所以在ORACLE中经常是用ORDER BY跟ROWNUM的组合来实现SELECT TOP N的查询)
SELECT * FROM TABLE1 WHERE ROWNUM<=N |
2. Infomix数据库
SELECT FIRST N * FROM TABLE1 |
3. DB2数据库
SELECT * ROW_NUMBER() OVER(ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM<=N |
或者
SELECT COLUMN FROM TABLE FETCH FIRST N ROWS ONLY |
4. SQL Server数据库
SELECT TOP N * FROM TABLE1 |
5. Sybase数据库
SET ROWCOUNT N GO SELECT * FROM TABLE1 |
6. MySQL数据库
SELECT * FROM TABLE1 LIMIT N |
7. FoxPro数据库
SELECT * TOP N FROM TABLE ORDER BY COLUMN |