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SQL id logic ~ Thoughts

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For the business I work for I have a platform setup that handles everything from messages to photos to blogs etc.


I have two tables that show id releations:

	sender int(9),
	receiver int(9),
	relation tinyINT NOT NULL DEFAULT 0 /* -1=Delete, 0=[Add]Pending, 1=related, 2=Blocked */

	owner int(9),
	id int(9),
	rating tinyint(1) /* - 0 through 9 rating - */

With these tables I can relate any ID to any ID:


With relations table I can relate a user to any other user, or to any other group ETC...

With the rating table I can have a user rate any group, page, blog, message, photo, album etc...


Because of this I have globally unique id's.


No message will have the same ID as a blog, or a user, or a group, or a page.

Currently I manage this in this manner:


ID's: (I added commas for readability)


(1)00,000,000 - users

(2)00,000,000 - groups

(3)00,000,000 - albums

(4)00,000,000 - photos

(5)00,000,000 - blogs

(6)00,000,000 - msg


As you can see, each object is represented by the leading digit. So currently,

to make sure they are all distinct, before anything is inserted I am doing a full join on all of these tables for the column 'id'.

If any results come back it generates a new 'id' to test for uniqueness.


I feel like the way I have this setup could probably be done a lot cleaner and smoother. I have tried googling solutions, but

I haven't had much luck because my scenario is kind of complex: not to say others haven't encountered this issue.


Anyways, if anyone has any thoughts or opinions I would greatly appreciate it. Thank you guys ~ Remey

Edited by Remenission
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First off, I would not use a global pool of IDs, because this is complex and makes it very difficult (if not impossible) to set up a proper database layout with foreign keys. Right now, your ratings don't point to any real entities, you're just storing arbitrary numbers. If I wanted to “rate” the ID −456, I could do that, which is obviously a problem.


A far better approach would be to have plain old per-table IDs and different tables for the different ratings. Even a single table with a type column (i. e. no referential integrity) is better.


If you absolutely must have global IDs, use random UUIDs (MySQL even has a function for that). Your uniqueness checks don't work.

Edited by Jacques1
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