七种数据库中Select Top的使用方法

1. Oracle数据库

SELECT * FROM TABLENAME WHERE ROWNUM <= N

2. Infomix数据库

SELECT FIRST N * FROM TABLENAME

3. DB2数据库

SELECT *
  FROM (SELECT * ROW_NUMBER() OVER({        ORDER BY COL1 DESC}) AS ROWNUM FROM TABLENAME)
 WHERE ROWNUM <= N
或者
SELECT COLUMN FROM TABLENAME FETCH FIRST N ROWS ONLY

4. SQL Server数据库

SELECT TOP N * FROM TABLENAME

5. Sybase数据库

SET ROWCOUNT N
GO
SELECT * FROM TABLENAME

6. MySQL数据库

SELECT * FROM TABLENAME LIMIT N

7. FoxPro数据库

SELECT * TOP N FROM TABLENAME ORDER BY COLUMN