哪个索引号由主键包含..？ [英] which index number contain by primary key ..?

问题描述

哪个索引号由主键/唯一键包含..？

which index number contain by primary key/unique key ..?

推荐答案

没有。

我认为你是一个很困惑什么是......

所有主键都是唯一的 - 它们必须是定义的。



索引号只是一个数字 - 它是唯一的，但它不一定是您从数据库中读取的同一行的相同数字...除非您专门设置，否则没有隐含的行号或索引可以参考特定查询返回行的顺序。

None of them.
I think you are a little confused as to what is what...
All primary keys are unique - they have to be by definition.

An index number is just a number - it is unique, but it won't necessarily be the same number for the same row next you you read from the database...there is no implicit row number or index you can refer to unless you specifically set the order in which that particular query returns rows.

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