I am developing round robin tournament and I have problem how to design database.
First I have season. Season contains list of tournament. Tournaments contains list of groups. Groups contains list participant. Then I have list of player. Different between player and participant is that participant is registered player which belongs to group. Then I have entity game which is defined by 2 participant and their score. So participant has list of games.
P = participant
G = game
P1 P2 P3
P1 X G1 G2
P2 G3 X G4
P3 G5 G6 X
Is this good model for my tournament ? I dont think so because I have duplicity in my db. G1 is just vice versa of G3 but I have no idea how to implement this model better
-- --------------------------------------------------------
--
-- Table structure for table `GAME`
--
CREATE TABLE IF NOT EXISTS `GAME` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`HOME_PARTICIPANT_ID` int(11) NOT NULL,
`AWAY_PARTICIPANT_ID` int(11) NOT NULL,
`HOME_SCORE` int(4) DEFAULT NULL,
`AWAY_SCORE` int(4) DEFAULT NULL,
PRIMARY KEY (`ID`),
KEY `HOME_PARTICIPANT_ID` (`HOME_PARTICIPANT_ID`),
KEY `AWAY_PARTICIPANT_ID` (`AWAY_PARTICIPANT_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
-- --------------------------------------------------------
--
-- Table structure for table `GROUPS`
--
CREATE TABLE IF NOT EXISTS `GROUPS` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`NAME` varchar(255) NOT NULL,
`TOURNAMENT_ID` int(11) NOT NULL,
PRIMARY KEY (`ID`),
UNIQUE KEY `NAME` (`NAME`,`TOURNAMENT_ID`),
KEY `TOURNAMENT_ID` (`TOURNAMENT_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
-- --------------------------------------------------------
--
-- Table structure for table `PLAYER`
--
CREATE TABLE IF NOT EXISTS `PLAYER` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`NAME` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`SURNAME` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`CLUB` varchar(255) DEFAULT NULL,
`USER_ID` int(11) NOT NULL,
PRIMARY KEY (`ID`),
KEY `USER_ID` (`USER_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
-- --------------------------------------------------------
--
-- Table structure for table `PARTICIPANT`
--
CREATE TABLE IF NOT EXISTS `PARTICIPANT` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`POINTS` int(4) NOT NULL DEFAULT '0',
`RANK` int(4) DEFAULT NULL,
`GROUP_ID` int(11) NOT NULL,
`PLAYER_ID` int(11) NOT NULL,
`SCORE` varchar(10) NOT NULL DEFAULT '0:0',
PRIMARY KEY (`ID`),
KEY `PLAYER_ID` (`PLAYER_ID`),
KEY `GROUP_ID` (`GROUP_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
-- --------------------------------------------------------
--
-- Table structure for table `SEASON`
--
CREATE TABLE IF NOT EXISTS `SEASON` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`NAME` varchar(255) NOT NULL,
PRIMARY KEY (`ID`),
KEY `USER_ID` (`USER_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
-- --------------------------------------------------------
--
-- Table structure for table `TOURNAMENT`
--
CREATE TABLE IF NOT EXISTS `TOURNAMENT` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`NAME` varchar(255) NOT NULL,
`SEASON_ID` int(11) NOT NULL,
PRIMARY KEY (`ID`),
KEY `SEASON_ID` (`SEASON_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
--
-- Constraints for table `GAME`
--
ALTER TABLE `GAME`
ADD CONSTRAINT `GAME_ibfk_1` FOREIGN KEY (`HOME_PARTICIPANT_ID`) REFERENCES `PARTICIPANT` (`ID`) ON DELETE CASCADE ON UPDATE CASCADE,
ADD CONSTRAINT `GAME_ibfk_2` FOREIGN KEY (`AWAY_PARTICIPANT_ID`) REFERENCES `PARTICIPANT` (`ID`) ON DELETE CASCADE ON UPDATE CASCADE;
--
-- Constraints for table `GROUPS`
--
ALTER TABLE `GROUPS`
ADD CONSTRAINT `GROUPS_ibfk_1` FOREIGN KEY (`TOURNAMENT_ID`) REFERENCES `TOURNAMENT` (`ID`) ON DELETE CASCADE ON UPDATE CASCADE;
--
-- Constraints for table `PARTICIPANT`
--
ALTER TABLE `PARTICIPANT`
ADD CONSTRAINT `PARTICIPANT_ibfk_1` FOREIGN KEY (`GROUP_ID`) REFERENCES `GROUPS` (`ID`) ON DELETE CASCADE ON UPDATE CASCADE,
ADD CONSTRAINT `PARTICIPANT_ibfk_2` FOREIGN KEY (`PLAYER_ID`) REFERENCES `PLAYER` (`ID`) ON DELETE CASCADE ON UPDATE CASCADE;
--
-- Constraints for table `TOURNAMENT`
--
ALTER TABLE `TOURNAMENT`
ADD CONSTRAINT `TOURNAMENT_ibfk_1` FOREIGN KEY (`SEASON_ID`) REFERENCES `SEASON` (`ID`) ON DELETE CASCADE ON UPDATE CASCADE;
If you say you have duplicity then you need re-visit your design. Have you ever used Enhanced relationship diagrams? This is a good tool to make sure you have a correct database design for you.
This is a good website to help you if you haven't done this before: http://users.csc.calpoly.edu/~jdalbey/205/Lectures/HOWTO-ERD.html
A tournament is just a binary tree. You can use a nested set or an adjacency list.
Related
I have tables that have been created like so:
CREATE TABLE `d_account` (
`id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
`account_name` varchar(128) CHARACTER SET utf8 NOT NULL,
`user_id` smallint(5) NOT NULL,
`type_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `FK_account_type` (`type_id`),
CONSTRAINT `FK_type` FOREIGN KEY (`type_id`) REFERENCES `d_types` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
);
CREATE TABLE `d_types` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(45) CHARACTER SET latin1 NOT NULL,
PRIMARY KEY (`id`)
);
How would I select all records that exist in both tables below using the foreign key where the d_type name equals ‘large’?
That's basically just a JOIN like this:
SELECT * FROM d_types t
JOIN d_account a ON t.id = a.type_id
WHERE t.name = 'large';
The * after select should be replaced by the columns you want to select.
I have a problem with MariaDB's foreign keys...
These are the tables:
CREATE TABLE `users` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL,
`email` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL,
`password` binary(20) NOT NULL,
`role` smallint(5) unsigned NOT NULL DEFAULT 2,
PRIMARY KEY (`id`),
UNIQUE KEY `users_email_UN` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
CREATE TABLE `roles` (
`id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `roles_name_UN` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
I can't understand why when I try to update "users" with this command:
ALTER TABLE unito_tweb.users ADD CONSTRAINT users_role_FK FOREIGN KEY (`role`) REFERENCES unito_tweb.roles(id) ON DELETE SET DEFAULT ON UPDATE CASCADE;
I get this error:
Can't create table `unito_tweb`.`users` (errno: 150 "Foreign key constraint is incorrectly formed")
I'm working on SQL Fiddle and code so far looks like this:
CREATE TABLE IF NOT EXISTS `orders` (
`id` int(6) unsigned NOT NULL,
`date` DATE NOT NULL,
`customerID` int(6) unsigned NOT NULL,
`paymentAmmount` float(6) unsigned NOT NULL,
PRIMARY KEY (`id`),
CONSTRAINT `FK_customers_customerID` FOREIGN KEY (`customerID`)
REFERENCES `customers` (`customerID`) );
CREATE TABLE IF NOT EXISTS `items` (
`id` int(6) unsigned NOT NULL,
`name` varchar(200) NOT NULL,
PRIMARY KEY (`id`) ) DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `customers` (
`customerID` int(6) unsigned NOT NULL,
`firstName` varchar(200) NOT NULL,
`lastName` varchar(200) NOT NULL,
`address` varchar(200) NOT NULL,
#`accountId` int(6) unsigned NOT NULL,
PRIMARY KEY (`customerID`) ) DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `items-orders` (
`id` int(6) unsigned NOT NULL,
`itemId` int(6) unsigned NOT NULL,
`orderId` int(6) unsigned NOT NULL,
`itemQuantity` int(1) unsigned NOT NULL,
PRIMARY KEY (`id`),
KEY `FK_items_itemId` (`itemId`),
CONSTRAINT `FK_items_itemId` FOREIGN KEY (`itemId`) REFERENCES `items` (`id`) ) DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `accounts` (
`id` int(6) unsigned NOT NULL,
`email` varchar(200) NOT NULL,
`passwordHash` varchar(200) NOT NULL,
PRIMARY KEY (`id`) ) DEFAULT CHARSET=utf8;
There are two lines that don't work:
KEY `FK_customers_customerID` (`customerID`),
CONSTRAINT `FK_customers_customerID` FOREIGN KEY (`customerID`) REFERENCES `customers` (`id`) ) DEFAULT CHARSET=utf8;
I'm trying to link the 'customerID' var in the 'orders' table to the same var in the 'customers' table.
It worked with the 'items-orders' and 'items' table, but now I keep getting this message:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'KEY `FK_customers_customerID` (`customerID`), CONSTRAINT `FK_customers_customer' at line 1
I really don't know how to fix this, any help would be appriciated.
The primary key in customers is CustomerId, so you need to use that:
CONSTRAINT `FK_customers_customerID` FOREIGN KEY (`customerID`)
REFERENCES `customers` (`customerID`)
This question already has answers here:
MySQL Creating tables with Foreign Keys giving errno: 150
(20 answers)
Closed 8 years ago.
Here's my schema:
-- Table 'users'
CREATE TABLE IF NOT EXISTS `users` (
`ID` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(50) COLLATE utf8_bin NOT NULL,
`password` varchar(100) COLLATE utf8_bin NOT NULL,
`registrationDate` datetime NOT NULL,
PRIMARY KEY (`ID`),
UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1;
CREATE TABLE IF NOT EXISTS tasks (
id bigint(20) NOT NULL AUTO_INCREMENT,
description TEXT,
title TEXT,
type TEXT,
createdDate DATETIME NOT NULL,
finishedDate DATETIME,
user_id bigint(20) NOT NULL,
PRIMARY KEY (id),
CONSTRAINT user_fk FOREIGN KEY (user_id) REFERENCES USERS(ID) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1;
I keep getting errno 150 when I try creating "tasks" table.
Looks like phpmyadmin on openshift is case sensitive, if you dig into the error you get this:
LATEST FOREIGN KEY ERROR
------------------------
140827 10:52:57 Error in foreign key constraint of table testing/tasks:
FOREIGN KEY (user_id) REFERENCES USERS(ID) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1:
Cannot resolve table name close to:
(ID) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1
In the below code, notice that i changed USERS to users in the second table creation code after REFERENCES.
Looks like this code works:
CREATE TABLE IF NOT EXISTS `users` (
`ID` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(50) COLLATE utf8_bin NOT NULL,
`password` varchar(100) COLLATE utf8_bin NOT NULL,
`registrationDate` datetime NOT NULL,
PRIMARY KEY (`ID`),
UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1;
CREATE TABLE IF NOT EXISTS tasks (
id bigint(20) NOT NULL AUTO_INCREMENT,
description TEXT,
title TEXT,
type TEXT,
createdDate DATETIME NOT NULL,
finishedDate DATETIME,
user_id bigint(20) NOT NULL,
PRIMARY KEY (id),
CONSTRAINT user_fk FOREIGN KEY (user_id) REFERENCES users(ID) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=1;
This is my database:
-- Host: localhost
-- Generation Time: Feb 04, 2011 at 01:49 PM
-- Server version: 5.0.45
-- PHP Version: 5.2.5
SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
--
-- Database: `myepguide`
--
-- --------------------------------------------------------
--
-- Table structure for table `channel1`
--
CREATE TABLE IF NOT EXISTS `channel1` (
`id` mediumint(255) NOT NULL auto_increment,
`channel` varchar(255) default NULL,
PRIMARY KEY (`id`),
KEY `channel` USING BTREE (`channel`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ;
--
-- Dumping data for table `channel1`
--
INSERT INTO `channel1` (`id`, `channel`) VALUES
(1, 'BBC One'),
(3, '<i>ITV1</i>'),
(2, '<i>ITV2 </i>');
-- --------------------------------------------------------
--
-- Table structure for table `myepguide`
--
CREATE TABLE IF NOT EXISTS `myepguide` (
`id` mediumint(9) NOT NULL auto_increment,
`programme` varchar(255) NOT NULL,
`channel` varchar(255) default NULL,
`airdate` datetime NOT NULL,
`displayair` datetime NOT NULL,
`expiration` datetime NOT NULL,
`episode` varchar(255) default '',
`setreminder` varchar(255) NOT NULL default '<img src="alert.gif" height="16" width="22"> Set Reminder',
PRIMARY KEY (`id`),
KEY `programme1` USING BTREE (`programme`),
KEY `channel2` USING BTREE (`channel`),
KEY `episode` (`episode`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;
--
-- Dumping data for table `myepguide`
--
INSERT INTO `myepguide` (`id`, `programme`, `channel`, `airdate`, `displayair`, `expiration`, `episode`, `setreminder`) VALUES
(1, 'Casualty', '<i>BBC One </i>', '2011-05-18 14:30:00', '2011-05-18 14:30:00', '2011-05-18 15:00:00', 'No Fjords in Finland', '<img src="alert.gif" height="16" width="22"> Set Reminder');
-- --------------------------------------------------------
--
-- Table structure for table `episode`
--
CREATE TABLE IF NOT EXISTS `episode` (
`id` mediumint(9) NOT NULL auto_increment,
`episode` varchar(255) default NULL,
PRIMARY KEY (`id`),
KEY `episode` USING BTREE (`episode`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;
--
-- Dumping data for table `episode`
--
INSERT INTO `episode` (`id`, `episode`) VALUES
(1, 'No Fjords in Finland'),
(2, 'Casualty 25th Special'),
(3, 'Palimpsest');
-- --------------------------------------------------------
--
-- Table structure for table `programme`
--
CREATE TABLE IF NOT EXISTS `programme` (
`id` mediumint(255) NOT NULL auto_increment,
`programme` varchar(255) default NULL,
PRIMARY KEY (`id`),
KEY `programme1` USING BTREE (`programme`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;
--
-- Dumping data for table `programme`
--
INSERT INTO `programme` (`id`, `programme`) VALUES
(1, 'Casualty');
--
-- Constraints for dumped tables
--
--
-- Constraints for table `myepguide`
--
ALTER TABLE `myepguide`
ADD CONSTRAINT `myepguide_ibfk_1` FOREIGN KEY (`programme`) REFERENCES `myepguide` (`programme`) ON UPDATE CASCADE,
ADD CONSTRAINT `myepguide_ibfk_2` FOREIGN KEY (`channel`) REFERENCES `channel1` (`channel`) ON DELETE SET NULL ON UPDATE CASCADE;
I cannot get the 'episode` table to link to that in the table myepguide for some reason, in Phpmyadmin it always says "Relation not added".
Deleting and re-creating it did not work either, so how can I fix this?
All are stored in InnoDB format so I can't understand why this happened.
Any help is appreciated!
As mentioned in the comment, I am not quite sure what are you trying to link here, so for starters you could use this to get an idea of possible relationships.
EDIT
create table TvSeries (
TvSeriesID int not null auto_increment
-- , other fields here
) ENGINE=InnoDB ;
alter table TvSeries
add constraint pk_TvSeries primary key (TvSeriesID) ;
create table Episode (
TvSeriesID int not null
, EpisodeNo int not null
-- , other fields here
) ENGINE=InnoDB ;
alter table Episode
add constraint pk_Episode primary key (TvSeriesID, EpisodeNo)
, add constraint fk1_Episode foreign key (TvSeriesID) references TvSeries (TvSeriesID) ;
create table Channel (
ChannelID int not null
-- , other fields here
) ENGINE=InnoDB ;
alter table Channel
add constraint pk_Channel primary key (ChannelID);
create table Programme (
ChannelID int not null
, StartTime datetime not null
, TvSeriesID int not null
, EpisodeNo int not null
-- , other fields here
) ENGINE=InnoDB ;
alter table Programme
add constraint pk_Programme primary key (ChannelID, StartTime)
, add constraint fk1_Programme foreign key (ChannelID) references Channel (ChannelID)
, add constraint fk2_Programme foreign key (TvSeriesID, EpisodeNo) references Episode (TvSeriesID, EpisodeNo) ;
create table myEpisodeGuide (
TvSeriesID int not null
, EpisodeNo int not null
, ChannelID int not null
, StartTime datetime not null
, SetReminder int not null
-- , other fields here
) ENGINE=InnoDB ;
alter table myEpisodeGuide
add constraint pk_myEpisodeGuide primary key (TvSeriesID, EpisodeNo, ChannelID, StartTime)
, add constraint fk1_myEpisodeGuide foreign key (TvSeriesID, EpisodeNo) references Episode (TvSeriesID, EpisodeNo)
, add constraint fk2_myEpisodeGuide foreign key (ChannelID, StartTime) references Programme (ChannelID, StartTime) ;