How to implemented Primary key and foreign key in delta tables.

Question

Accepted Answer

Primary keys and foreign keys can be implemented in delta tables using constraints and references.

Primary keys can be implemented using the PRIMARY KEY constraint, which ensures that each record in the table has a unique identifier.
Foreign keys can be implemented using the FOREIGN KEY constraint, which establishes a link between two tables based on a common column.
The referenced table must have a primary key defined, and the foreign key column in the referencing table must have the same data type as the primary key column in the referenced table.
Foreign key constraints can enforce referential integrity, ensuring that data in the referencing table matches the data in the referenced table.
Delta tables support the creation of primary and foreign keys using SQL statements.

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