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Como posso obter as chaves estrangeiras de uma tabela no mysql


Maneira simples de obter chaves estrangeiras para determinada tabela:
SELECT
    `column_name`, 
    `referenced_table_schema` AS foreign_db, 
    `referenced_table_name` AS foreign_table, 
    `referenced_column_name`  AS foreign_column 
FROM
    `information_schema`.`KEY_COLUMN_USAGE`
WHERE
    `constraint_schema` = SCHEMA()
AND
    `table_name` = 'your-table-name-here'
AND
    `referenced_column_name` IS NOT NULL
ORDER BY
    `column_name`;