I am new to couchdb.Now I am working on a couchdb project in my university.My project is football schema,where I have to prepare documents for players and clubs.I have already created individual documents for players and clubs in couchdb.but I dont know how to relate the players documents to the clubs documents.I mean which player belongs to which club...
You can store a list of doc IDs of players in each club document and/or the doc ID of the club of the player in each player document.
Then you can use views and lists to find all players in a team for instance.
Note that it is your responsibility to keep the database consistent (that is to remove the doc ID of a player from its club when you remove the player from the DB for instance).
Related
I'm working on a database project about music and albums in MySQL, where i make a list over some popular artists, their most sold album, and the songs contained within them. But i suddenly got really uncertain of what to do when it comes to filling in the name of the songs for each album. Should i make an individual table for each list of songs, or should all the songs (about 50 of them in total from all the albums) from all the different artists (5 different artists) be filled inn in the same table (i'm eventually gonna export the data and connect it to a PHP folder
Hope the question was clear
All the songs should be in one "Songs" table. Then you create a column "Album ID" in that table which is a foreign key back to the ID column in the albums table. This is how you know which song belongs to which album. (And of course you have the same kind of relationship between "album" and "artist".)
This is called a "one-to-many" relationship and is one of the basic principles of relational database design.
If you ever find yourself creating multiple tables to represent the same kind of data item, you know you've gone wrong.
N.B. If you want to support the idea that the same song (or track probably, to be more accurate, since many different recordings of a song could potentially be made) can be included on multiple albums, then you'll need to implement a "many-to-many" relationship where you have an extra table in between "albums" and "songs" which holds Album ID and Song ID. Each would be a foreign key back to the Albums and Songs tables, respectively. And to ensure no duplication, both fields would be specified as a Compound Primary Key. That way you can list the same Song ID in that table many times against different albums. Same again if you want to have that flexibility in the relationship between "artists" and "albums".
This might be a good time to take a break and study relational database design and data normalisation concepts in some more detail, then you can start to see these patterns for yourself and make the right decision in your schema designs.
Similarly to this question about databases for playlists you should also use one table for the albums and one table for the songs.
Additionally you might also need a table for artists, etc.
I'm working for a database project that my professor gave to me and now i'm designing the relational schema of database.
I have three entity types album, photo and video that means an album can contain both of them, but I have no idea how to tie them up together.
I'm a beginner in this field so please give me some advice what to do ?
I assume an album can contain several photos and videos. You can create a table joining them. This table can have essentially fours columns: the id of the album, the id of the photo or video, a flag distinguishing whether photo or video, and an index to define the order of the items within an album.
It can of course have an own ID (drawn from a sequence or via autoincrement), a timestamp when it was created, a userid by whom etc.
Can several copies of the same photo belong to an album?
I'm trying to design an database using Laravel's relationships for a sports site. So far I've got 8 tables planned:
Organization
League
Season
Teams
Roster
Games
Players
Stats
Each Team belongs to and Organization and a League. Organizations and Leagues has many teams. This is because Organizations can have teams in different leagues.
After that I'm starting to run into questions. My plan is that the Games table will store Home and Away teams, so I think that's a has many relationship. Games also need to be part of a season and league so Games would belong to Season and League. Am I on track there?
Also, Players can belong to more then one Team during the same Season. That's why I did the Roster table do that Players can be linked with Teams and Seasons there. Plus I'm hoping that would be historical rosters by Season. I can't wrap my head around what relationships I need to pull this off.
Last would be Stats which would belongTo Games and Players and each player would have their own Stat row for each game played. Or would have be a has Many relationship?
For Games, you can simply have a home_team_id and an away_team_id foreign key column to the Teams table; this would be two belongsTo relationships for Game and one hasMany relationship for Team.
As for Rosters, it sounds like a simple pivot table and a belongsToMany relationship between Players and Teams. Rosters would have: player_id, team_id, and season_id. For Player, Roster, and Team, you could have a maximum of two belongsToMany relationships each.
I'm building a game system and I'm designing a database for this which keeps track of the games that players have played. Here are the entities in my system:
1.Players 2.Groups 3.Games
Each player can belong to multiple groups and a group will have multiple players in it.
Games will be played in the context of group by the players in that group. So each game will have a group that it is being played in and the players who are involved in that game.
In addition to players personal stats, each player will have stats specific in the context of their group. What tables do I need for this system.?
Here is what I have thought of so far, I will have a players table. Each player with a unique id and rest of his information, along with his stats combined across all of his groups. There will be a group table, with group id, group name and other information about group.
I don't know how to represent players to group relationship. Also I'm not clear on how the game table would look like. I'd assume each game has a unique id, players playing it and the group id in which that game belongs to.
yes you need relation or associative tables...
something like
player_group
---------------
player_id
group_id
game_player
-------------
player_id
game_id
in the game table:
game
----------
game_id
group_id
I have a RESTful server which I use as a server for mobile games, I am now trying to create a database (Using NHibernate) but I am not certain how to do this certain thing properly in a database
In the database there are users, each user can participate in many games, game is a superclass which QDGame inherits (that class also has children that inherits but thats not important here) so one player can be part of 10 QDGame's
My dillemma is that X number of players can be part of one Game, so should I have a list down in Game of type List? I would think thats wrong, as each player would have many games and each game would have many players (Fantrap?)
So how should I have the link between many games shared between many users?
If i'm understanding your question properly, you are looking for a many-to-many relationship here
Users [UserId, ....]
Games [GameId, ...]
GameUsers[GameUserId, GameId, UserId, ...]