Declarative referential integrity in SQL Server is frequently used to ensure referential integrity.
As shown in the statement in Listing 1, you may add a foreign key and references constraint to impose referential integrity restrictions. Additionally, when creating SecondaryTable, you have the option to build a reference between it and PrimaryTable.
The CREATE TABLE and ALTER TABLE statements in SQL provide support for the referential integrity concept. To include a referential constraint, use the CREATE TABLE or ALTER TABLE statements. Use the ALTER TABLE statement to lift a referential restriction.
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