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I am designing a database for a simple browser based game. To isolate my problem, let's presume there are 2 tables that reference each other like the following Player ( p_id, p_name, inventory(multiple i_id) ) Item ( i_id, i_name ) The problem is with inventory column that is for storing multiple i_id of Item table. First of all, I don't know if it would be a good design practice to make it hold multiple id values in a single column.

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Alternative is to divide into 3 tables as Player ( p_id, p_name ) Item ( i_id, i_name ) Inventory ( i_id ) Now, Inventory is no more a column so can now hold multiple i_id but then, how do I reference this set of inventory data to a unique player? Like most RPG games, each player has own inventory where they can store their items and take subsequent actions.

Hello, I want to create a game for social network. The game's database must store information about users, their items and scores. It must be possible to add/extract scores and items QUICKLY, because there may be (I hope:)) a lot of players. I think my DB tables should be created like this: CREATE TABLE users ( user_id UNSIGNED INT PRIMARY KEY, score UNSIGNED INT ); CREATE TABLE items ( user_id UNSIGNED INT PRIMARY KEY, item_id UNSIGNED TINYINT ); Also, can the users be added in a sorted (by score) order? If so, how to do that? Any advices, suggestions about improvement and implementation will be highly appreciated.

Yes, it is possible. Add a UNIQUE CLUSTERED INDEX on Score, Id. But it would be a bad idea. Dent May there.

You are worrying about speed before having what to store, to the point that you're trying to define how it will be stored. First get it designed, then worry about speed. It is unlikely it will be slow. And even if it end up being slow, solutions abound. What can help and which is best can only be determined after the actual problems are encountered. Sure, you can have an eye towards them now, but don't let that change storage! What you suggested will work, but there is little for us to go on.

For example, score is usually a total of other things. A DB can store the things and total the score for you. CREATE TABLE Player(Id INT PRIMARY KEY, Score INT NOT NULL DEFAULT 0); CREATE TABLE Item(Id TINYINT PRIMARY KEY, Name VARCHAR(20), Description VARCHAR(255)); CREATE TABLE Player_Item(Player INT REFERENCES Player, Item TINYINT REFERENCES Item, PRIMARY KEY(Player, Item)); Though, it would be ideal to name the CONSTRAINTs as well. Ordering the result set is basic SQL: SELECT Id, Score FROM Player ORDER BY Score DESC. Brian, thank you for the answer. >For example, score is usually a total of other things Due to specific of the game scores don't depend on other things, they depend only on time. The reason, why I ask the question is because I don't know if my DB will work fast, especially when getting items of the particular player.

>Ordering the result set is basic It isn't exactly what I need:) I want to store all the data sorted by score, because I need a best results table. If the data in the DB will be sorted in descending order, all I need is to show first n results. Is it possible to do such a thing? Yes, it is possible. Add a UNIQUE CLUSTERED INDEX on Score, Id.

But it would be a bad idea. You are worrying about speed before having what to store, to the point that you're trying to define how it will be stored. First get it designed, then worry about speed. It is unlikely it will be slow. And even if it end up being slow, solutions abound. What can help and which is best can only be determined after the actual problems are encountered. Sure, you can have an eye towards them now, but don't let that change storage!