Web Reference: The answer on this page by Mike M. is correct: The way a FK works is it cannot have a value in that column that is not also in the primary key column of the referenced table. What is missing from that answer is: You must build the table containing the primary key first. To drop a FOREIGN KEY constraint, use the following SQL: Exercise? What is this? The FOREIGN KEY constraint is used to: Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. Dec 9, 2025 · A FOREIGN KEY constraint is a concept in SQL that enforces a valid relationship between two tables by ensuring that the values stored in the child table correspond to existing values in the parent table. This constraint protects the database from inconsistent or invalid relational data.
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How To Resolve Fk Answer Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
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Last Updated: April 9, 2026
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