MySQL和Oracle DB之间的区别
问题描述：
MySQL和Oracle 11g之间在功能和性能上有什么区别?我希望能够根据情况在两者之间做出明智的选择.
What are the differences - features and performance - between MySQL and Oracle 11g? I would like to be able to make and educated choice between the two given a situation.
注意:显然，指向测试的链接会有所帮助.
Note: Links to test will obviously help.
答
MySQL仍然缺乏(Oracle拥有)
Things that MySQL is still lacking (that Oracle has)
- 可延迟约束
- 检查约束
- 递归查询
- 表函数
- 常用表表达式
- 窗口功能
- 基于功能的索引
- 部分索引
- 没有减号(或INTERSECT)运算符
- 关于子选择的非常简单的查询优化器
- 很多非标准语法(||是逻辑或！)
- 不闪回
- deferrable constraints
- check constraints
- recursive queries
- table functions
- common table expressions
- windowing functions
- function based index
- partial index
- No MINUS (or INTERSECT) operator
- very simple query optimizer when it comes to sub-selects
- A lot of non-standard Syntax (|| is a logical or!)
- no flashback