不同数据库查询表前N位的数据SQL

MCR

sql在不同数据库查询前几条数据

1. ORACLE
  SELECT * FROM TABLE1 WHERE ROWNUM<=N
  HQL: from table1 t order by t.createTime desc where rownum<=n


2. INFORMIX
   SELECT FIRST N * FROM TABLE1





4. SQL SERVER
SELECT TOP N * FROM TABLE1


5. MYSQL
SELECT * FROM TABLE1 LIMIT N


hibernate查询记录的前10条记录

就像mysql的SQL语句的"select * from table limit 10" hql 不支持limit

query.setFirstResult(0);//从第0条开始取

query.setMaxResults(10);//取十条记录


6. FOXPRO
SELECT * TOP N FROM TABLE ORDER BY COLUMN

7.postgres查询前几条记录SQL
SELECT * FROM TABLE LIMIT

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