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原标题:mysql primary key starts with pattern

我有两本书,在Mysql数据库中流动。

表4

1. book_id|book_name  
2. mobile_id|mobile_name

还创建了第三种表格产品,其结构如下:

  1. product_id|product_name

现在,我希望这本书能够以我方言中的模式开始。

例如,

book_ids -> 11,12,13,14,15,16,17,18,19,110,111,112,...  
mobile_ids -> 21,22,23,24,25,26,27,28,29,210,211,212,...

现在,在我的产品表中,我本可以做到,

product_id -> 11,21,16,26, if this starts with pattern is not set, then the problem would be,

产品_id-> 1,6,6.its不是独一无二的。

How to handle this..?

Edited stuff below:

因此,你指的是这一点吗?

<>光线>

category_id | category_name

1 | books
2 | mobiles

<<>strong>book_table

book_id | book_name

1 | da vinci code
2 | alchemist

http://www.ohchr.org。

mobile_id | mobile_name

1 | nokia
2 | samsung

http://www.un.org。

id | product_name | product_id | category_id

1 | da vinci code | 1 | 1
2 | alchemist | 2 | 1
3 | nokia | 1 | 2
4 | samsuing | 2 | 2

最佳回答

你似乎没有理由重复资料。

仅制作一个产品表格:

id | name | type (e.g. 0 book, 1 mobile, etc) | price | ....
问题回答

暂无回答




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