Tag: sql foreign key constraint

SQL FOREIGN KEY Keyword

FOREIGN KEY

The FOREIGN KEY constraint is a key used to link two tables together.

A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.

Continue reading SQL FOREIGN KEY Keyword

Posted on 2025-03-08Categories SQLTags sql, sql coalesce, sql foreign key allow null, sql foreign key as primary key, sql foreign key cascade, sql foreign key constraint, sql foreign key constraint failed, sql foreign key naming convention, sql foreign key on delete, sql foreign key on delete cascade, sql foreign key to multiple tables, sql foreign key vs primary key, sql insert, sql joins, sql server, sql server management studio, sql union, sql update, sqlalchemy, sqlite

SQL FOREIGN KEY Constraint

The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables.

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 primary key is called the referenced or parent table. Continue reading SQL FOREIGN KEY Constraint