花了点时间整理了一下，取一表前N条记录，各个数据库的SQL写法：

1. ORACLE

SELECT * FROM TABLE1 WHERE ROWNUM<=N

2. INFORMIX

SELECT FIRST N * FROM TABLE1

3. DB2

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

DB2

SELECT COLUMN FROM TABLE FETCH FIRST N ROWS ONLY

4. SQL SERVER

SELECT TOP N * FROM TABLE1

5. SYBASE

SELECT TOP N * FROM TABLE1

6. mysql:

select * from table_name limit N