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Questions tagged [junction-table]

A junction table is a table that contains common fields from two or more tables and is the canonical way to implement Many-to-Many relations in SQL and Relational-type databases.

In database management systems following the relational model, a junction table is a table that contains common fields from two or more tables. It is on the many side of a one-to-many relationship with each of the other tables. Junction tables are known under many names such as bridge table and linking table.

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Is there any way to automatically add a new row into a junction table in sql?

I have two tables, tbl_Interview and tbl_JobSeeker the relation between the two is many to many, the normalization rules require me to create a new table which I called tbl_Interview_JobSeeker with the other two tables primary keys, my question is:…
Mr.Toxy
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Add One to Many relationship in junction table in Hibernate

I have two table with Many to Many relationship Table 1 Table 2 Junction Table ---Game--- ---Player--- ---GamePlayer--- gameID(PK) playerID(PK) gameID gameDetails playerDetails playerID …
Sagar Sadavarte
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Junction tables in T-SQL

In my database application, when I try to attach a page to a site, I get the following error: System.InvalidOperationException: Can't perform Create, Update or Delete operations on 'Table(Junc_Page_Site)' because it has no primary key. I intend a…
Greg
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SQLite, Golang and junction table

I would like to create a small database of books using Go and sqlite. I took the main from this advise SQLite foreign key examples and redeveloped it a bit. package main …
Paul Poloskov
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How can i convert a comma separated columns into junction table?

I am pretty new to mysql and this site. I got an old mysql database (100.000 entries) to migrate to our new system. This is the old table: CUSTOMER Customer_ID Name Categories 1 Bob 1,2 2 Phil NULL 3 …
Squarius
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Manipulating junction table with PHP

I am creating app with PHP that uses Mysql DB to manage data. Tables are like this: user purchasing medicine ____ ________ ________ id_user id_user id_medicine username id_medic item What really…
fugitive
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Undefined method using junction table

I am getting the following error, and I can't seem to work out how to resolve the issue undefined method `menu_attribute_value' for # %section.block-list - @attr.each do |attrs, values| %header= attrs …
Boss Nass
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MySQL update join query to solve duplicate Values

I have a Categories table which has some duplicate Categories as described below, `Categories` +========+============+============+ | cat_id | cat_name | item_count | +========+============+============+ | 1 | Category 1 | 2 | | …
Aung Myo Linn
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How can I access data from my junction table?

I have created a junction table between two of my tables to create a many to many relationship between them.I am able to save data to them, but can't access that data again. This is written in MVC ASP.NET by the way. My first table: CREATE TABLE…
Jon
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Why the primary id of a link / junction table row changes on existing rows when new row is added to it?

I'm running a web project on WildFly8 and my database is SQL Server 2012. I created a junction table service_service_package to associate Service and ServicePackage entities in a ManyToMany relationship, since services can belong to many service…
Steve Waters
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SQL junction query

I'm very new to SQL and I'trying to do a query on the data that I've entered to find bottles of wine sold by Danmurphys that are less than $20. The query I've composed is down the bottom but the syntax isn't right and I'm not sure what I'm doing…
Michael Higgon
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Populate (UPDATE) parent id's based on previous rows?

In my database there is a table of categories. In order to select those categories hierarchically, I'm looking for a way to populate the parent id's in the junction table (shown below). Right now, only the parent id's for the sort_order 1 rows are…
EternalHour
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MEAN Stack: junction tables

I'm new in Mean Stack workflow and my background relays on MySql schemas. I'm creating a little application to improve my skills on it, and I've encountered a logic question. I've created two Schemas: a User schema and a Ticket schema. Now I've to…
Marco Mantovani
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yii2: get records by relations id

I have Images model with relation: public function getAlbums() { return $this->hasMany(ImagesTerms::className(), ['id' => 'term_id']) ->viaTable(ImagesTermsRelations::tableName(), ['object_id' => 'id']) …
Ulugov
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MySQL - select all items with multiple hashtags

I'm making hashtag system for my webpage, and have three tables: items - ID and some others tags - ID and name item_tags - junction table with IDitem and IDtag Selecting all items with given hashtag is pretty easy: SELECT items.* FROM items join…
crueltear
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