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
