oracle/db2/sqlserver/sybase/mysql数据库取前几条数据写法

oracle/db2/sqlserver/sybase/mysql数据库取前几条数据写法

1. ORACLE

SELECT * FROM TABLE1 WHERE ROWNUM<=N 

 

2. INFORMIX 

SELECT FIRST N * FROM TABLE1 where 1=1 

 

3. DB2 

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

或者 

SELECT COLUMN FROM TABLE where 1=1 FETCH FIRST N ROWS ONLY 

 随意获取10条数据:
select     *     from   content   order   by   rand()   fetch   first   10   rows   only;

 加条件的:

select id from content where 1=1 order by id fetch first 1 rows only  ;

 

4. SQL SERVER 

SELECT TOP N * FROM TABLE1 where 1=1 

或者

SET ROWCOUNT N SELECT * FROM TABLE1 where 1=1 SET ROWCOUNT N1 

 

5. SYBASE

 SET ROWCOUNT N SELECT * FROM TABLE1 where 1=1 SET ROWCOUNT N1 

注：执行SET ROWCOUNT 0 可取消ROWCOUNT设置

 

6. MYSQL 

SELECT * FROM TABLE1 where 1=1 LIMIT N 

 

7. FOXPRO 

SELECT * TOP N FROM TABLE ORDER BY COLUMN 

 

8. ACCESS 

SELECT TOP N * FROM TABLE1 where 1=1