A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table. The table with the foreign key is called the child table, and the table with the ...
FOREIGN KEY (friendship_status_id) REFERENCES friendship_statuses (id) ON DELETE CASCADE; -- Создаю внешний ключ для таблицы СООБЩЕНИЙ ALTER TABLE messages ADD CONSTRAINT messages_from_user_id_fk ...
Oracle announced the general availability of MySQL Cluster 7.3, which adds foreign key support, a new NoSQL JavaScript Connector for node.js, and an auto-installer to make setting up clusters easier.
FOREIGN KEY (UGID) REFERENCES UnderGruppe (UGID), INDEX IDX_MaskinSecifikation_Navn (Navn), INDEX IDX_MaskinSecifikation_Navn_UGID (Navn, UGID), INDEX IDX ...
I'm working on a web app, and it part of it, there is a very simple database-driven file/document manager. As a file manager, there is the possibility of sub-folders. So in the DB, I have the ...
We are rewriting a large Django application which uses a MySQL database, and the database schema needs to undergo major modifications. We're also porting the app to use PostgreSQL, for a couple of ...
SQL has become the standard language for interacting with relational databases. An SQL database uses tables to store and manage structured data with a focus on data integrity and relationships. MySQL, ...
Today, Structured Query Language is the standard means of manipulating and querying data in relational databases, though with proprietary extensions among the products. The ease and ubiquity of SQL ...
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