Learn how to use CREATE TABLE, ALTER TABLE, and CONSTRAINT to create, modify, and view primary and foreign keys in SQL DB2 tables.

Primary Key ensures data uniqueness and prevents duplicate records. Foreign Key establishes relationships between tables, enabling data consistency and referential integrity.

Foreign key is used to establish a link between two tables . it always define in reference of primary key ( another table ) . it act as a primary key in its own table and foreign key for another table ...

For National 5 Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.

Cascading referential integrity constraints are foreign key constraints that tell SQL Server to perform certain actions when a primary key field in a primary key-foreign key relationship is ...

Every table that needs to relate to Persons should have a field that corresponds to the Persons primary key, and to preserve relational integrity that field should have a foreign key constraint.

The difference between a composite key, a foreign key and a primary key is a good illustration of the complex nature of relational database standards.

A Foreign Key is a column (or combination of columns) in one table that establishes a link to the Primary Key of another table. It is used to maintain referential integrity between tables.

For Higher Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.