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Oracle与Mysql主键、索引及分页的区别小结

WBOY
WBOYOriginal
2016-06-07 17:55:58970browse

Oracle与Mysql主键、索引及分页的区别,学习oracle的朋友可以参考下

区别:

1、主键,Oracle不可以实现自增,mysql可以实现自增。

oracle新建序列,SEQ_USER_Id.nextval

2、索引:

mysql索引从0开始,Oracle从1开始。

3、分页,

mysql: select * from user order by desc limit n ,m.

表示,从第n条数据开始查找,一共查找m条数据。

Oracle:select * from user
select rownum a * from ((select * from user)a)
select * from (select rownum a.* from (select * from user) a )
where r between n , m .

表示,n表示从第n条数据查询,查找到m条数据。
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