![]() ![]() INSERT INTO authors (name) VALUES ('John Smith'), ('Jane Doe'), ('Mark Johnson'), ('Emily Wilson') Step 3: Insert Data into the Parent and Child Tables Sample Database: Table: authors author_id Step 2: Create the Child Table with a Foreign Key ConstraintĪuthor_id INT REFERENCES authors(author_id) Let’s now explore how to use foreign keys in psql with step-by-step instructions and examples: Step 1: Create the Parent Table You cannot directly modify or delete a row in a referenced table if it has dependent rows in the child table. ![]()
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