主流数据库查询前几条记录SQL语句

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
或者
   SELECT COLUMN FROM TABLE FETCH FIRST N ROWS ONLY
4. SQL SERVER
   SELECT TOP N * FROM TABLE1
5. SYBASE
   SET ROWCOUNT N
   GO
   SELECT * FROM TABLE1
6. MYSQL
   SELECT * FROM TABLE1 LIMIT N
7. FOXPRO
   SELECT * TOP N FROM TABLE ORDER BY COLUMN

8.postgres查询前几条记录SQL
    SELECT * FROM TABLE LIMIT

 

select to_char(sysdate,'mm') from dual;     查询本月的记录