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The most effective approach to establish foreign keys for three adjacent tables is to use a chain of Foreign Key constraints.
For example, if Table A has a primary key that is referenced by Table B, and Table B has a primary key that is referenced by Table C, then you can set up foreign key constraints to enforce referential integrity between the tables as follows:
- Create a Foreign Key constraint on Table B's foreign key column that references the primary key column in Table A.
- Create a Foreign Key constraint on Table C's foreign key column that references the primary key column in Table B.
This approach ensures that the values in the foreign key columns of Table B and Table C actually exist in the corresponding primary key columns of Table A and Table B, respectively. This helps to maintain data integrity and consistency across the three tables.