本文介绍了在多种数据库中实现TOP N查询的方法，包括Oracle、INFORMIX、DB2、SQL Server、Sybase及MySQL等。每种数据库都有其特定的语法来限制返回结果的数量。
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
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
扫一扫
127
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
