各个数据库select出前N个数据

1. ORACLE 
SELECT * FROM TABLE1 WHERE ROWNUM<=N 
2. INFORMIX 
SELECT FIRST N * FROM TABLE1 where 1=1 
3. DB2 
SELECT * ROW_NUMBER() OVER(ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM<=N 
或者 
SELECT COLUMN FROM TABLE where 1=1 FETCH FIRST N ROWS ONLY 
4. SQL SERVER 
SELECT TOP N * FROM TABLE1 where 1=1 
or 
SET ROWCOUNT N SELECT * FROM TABLE1 where 1=1 SET ROWCOUNT N1 
5. SYBASE 
SET ROWCOUNT N SELECT * FROM TABLE1 where 1=1 SET ROWCOUNT N1 
6. MYSQL 
SELECT * FROM TABLE1 where 1=1 order by radom() LIMIT N 
7. FOXPRO 
SELECT * TOP N FROM TABLE ORDER BY COLUMN 
8. ACCESS 
SELECT TOP N * FROM TABLE1 where 1=1