How Can I Find Tables with Foreign Keys Referencing a Specific Table and Column in MySQL?

Identifying Tables with Foreign Keys Referencing a Specific Table and Column

To determine which tables reference a particular table and column as foreign keys, and which of those tables contain actual data in those foreign keys, the following MySQL query can be employed:

SELECT *
FROM information_schema.KEY_COLUMN_USAGE
WHERE REFERENCED_TABLE_NAME = 'X'
  AND REFERENCED_COLUMN_NAME = 'X_id';

This query retrieves information from the information_schema.KEY_COLUMN_USAGE table, which contains metadata about foreign key relationships in the database. By filtering on REFERENCED_TABLE_NAME and REFERENCED_COLUMN_NAME, the query identifies tables with foreign keys pointing to the specified table and column.

To narrow the results further and ensure that only tables with actual values in the foreign keys are listed, you can modify the query as follows:

SELECT *
FROM information_schema.KEY_COLUMN_USAGE
WHERE REFERENCED_TABLE_NAME = 'X'
  AND REFERENCED_COLUMN_NAME = 'X_id'
  AND TABLE_SCHEMA = 'your_database_name';

This modification includes an additional filter on TABLE_SCHEMA, which allows you to specify the specific database that you want to query.

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