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;
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