Sometimes we need to add ulterior constraints to the table we define. The ALTER TABLE statement enables us to do this. There are several types of constraints we can add. If we want to ensure that all ...
As a result, the relationship between two tables involves two actors, a parent table and a child table. The relationship can be enforced by defining the right foreign key constraint on the columns.
🌟 Key Takeaways: The PRIMARY KEY constraint is vital for ensuring the uniqueness and integrity of each record in a table. It prevents NULL values and duplicate entries in the primary key column.
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