How can I query using a foreign key in MySQL?

How can I query using a foreign key in MySQL?

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MySQL many-to-many relationship with FOREIGN KEYS

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Symfony2 Doctrine schema update fails

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Laravel 5.1: Enable SQLite foreign key constraints

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Ignore MySQL foreign key constraints in PHP

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'Delete' user but keep records (foreign keys)

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Primary key and foreign key at the same time with doctrine 2

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Laravel migration self referencing foreign key issue

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phpMyAdmin foreign key drop-down field values

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add foreign key in Codeigniter migration

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How can I merge two redundant records in a MySQL table, maintaining all PK/FK relationships?

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Reasons why you wouldn't use a foreign key? [php + MySQL]

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SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails - Laravel

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