不同数据库中查询前几条记录的用法(SQL Server/MYSQL /Oracle/Postgresql)

SQL在不同数据库中查询前几条记录的用法分类

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  n

=================================================================================================
如在ms sqlserver 用此语句：

select top 2 * from test01 就会只显示前2条记录，

MYSQL/PostgreSQL

select * from your_table where .... limit 2;

//使用limit就可以了.

Oracle的语句:

select * from (select rownum r ,* from test) tt

where tt.r > 50 and tt.r <= 100; (最好用PLSQL游标来解决)

DB2中：

select * from payment fetch first 5 row only --查前5条记录