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10.15.2008 at 09:31PM PDT, ID: 23819238
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9.2

Help with Database Design

Asked by Simon336697 in MySQL Server, PHP Scripting Language, Database

Hi Everyone.
Guys I have the following setup.

A) A Many to Many Relationship:
1 category can belong to many technolgies
1 technology can have many categories

technologies_tek:                              technologies_categories_tekcat:                          categories_cat:
id_tek (PK)   <--1-----------Many---     fk_idtek_tekcat (FK, PK)                                      
name_tek (unique)                              fk_idcat_tekcat (FK, PK) ---Many -------------1--> id_cat (PK)
                                                                                                                                          name_cat (unique)

B) This is the part Im struggling with:
I want to create an entries table called 'entries_ent', which has the following criterion:
(i) 1 entry can only belong to 1 technology
(ii) 1 entry can only belong to 1 category
What Im not sure about is how to define what foreign keys to what tables in the new entries_ent table.
Do I create foreign keys to the technologies_tek and categories_cat tables, or do I create foreign keys to each of the "foreign keys" in the linked table called technologies_categories_tekcat?

Any help on this greatly appreciated.
Basically the only things I want unique in the entries_ent table are:
id_ent
name_ent (which is the name of the new entry)
Im just not sure how I "look up" or reference the technology and category that this new entry record will belong to. The new entry must belong to a technology and a category.

Thank you.

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[+][-]10.15.2008 at 11:39PM PDT, ID: 22728500

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Zones: MySQL Server, PHP Scripting Language, Database
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Solution Provided By: momi_sabag
Participating Experts: 1
Solution Grade: A
 
 
[+][-]10.16.2008 at 12:14AM PDT, ID: 22728614

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