在这种情况下如何创建数据库表？

Question

I have created a table called "users" which is having

1. userID (primary key)
2. username
3. password
4. name

so now scenario is each user can have n-number of categories which mean userID=1 may have category1, category2, category3 so on and again each categories may have n-number of sub categories. So how can I design my tables? Any suggestions ?

Answer 1

Simple, the proposed DB Design could be like the following

 1. tbl_users(uid, uname, password, Name, ...)
 2. tbl_categories(cid, cname, parent_category_id ...) -- self join
 3. tbl_user_categories (uid, cid) -- Mapping table

Some Notes:

• Having sensitive information like user names , passwords and names and other details in one table is not advisable.
• It is better start learning using some good tutorials over internet to understand DB concepts
• stackoverflow is for specific coding or other specific technical problems you struck with, not for asking DB designs.