本文介绍了在Oracle、DB2、SQL Server、Sybase及MySQL等主流数据库中实现获取表中前N条记录的方法。针对不同数据库的特点，提供了特定的SQL语句示例，并涵盖了简单的直接获取和按特定字段排序后再获取的需求。
1. ORACLE
SELECT * FROM TABLE1 WHERE ROWNUM<=N
2. 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
3. SQL SERVER
SELECT TOP N * FROM TABLE1
4. SYBASE
SET ROWCOUNT N
GO
SELECT * FROM TABLE1
5. MYSQL
SELECT * FROM TABLE1 LIMIT N
要实现先排序,再取前几名用下面这条语句
select * from (select * from table order by 字段名 desc) where rownum<n
SELECT * FROM TABLE1 WHERE ROWNUM<=N
2. 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
3. SQL SERVER
SELECT TOP N * FROM TABLE1
4. SYBASE
SET ROWCOUNT N
GO
SELECT * FROM TABLE1
5. MYSQL
SELECT * FROM TABLE1 LIMIT N
要实现先排序,再取前几名用下面这条语句
select * from (select * from table order by 字段名 desc) where rownum<n
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