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. You need to have already declared the table that the foreign key references, before you can define a foreign key that references it. Once you declare the second table Recent versions of MySQL have implemented support for foreign keys with an ADD FOREIGN KEY clause to define the appropriate field as a  This post explains the possibilities offered by foreign key constraints . mysql create unique index index customer id on orders(customer id) . As documented under FOREIGN KEY Constraints The syntax for an InnoDB foreign key constraint definition in the CREATE TABLE or ALTER TABLE  What column is your foreign key referencing FOREIGN KEY (A) REFERENCES table (column) An easier solution is just to skip the foreign key declaration, since MySQL If you have imported a database using an SQL script and do not need to add fields to your tables you may find it more effective to define foreign keys using the  The ORM is compatible with both schemes of defining properties.. The model manager manages foreign key constraints for these relationships, the definition of these helps referential integrity as well as easy . mysql desc robots similar  I have a large database structure. My hosting plan says I can have unlimited databases but each database is limited to 1 GB. How can I define a foreign key in  Learn MySQL table commands from creating a table to adding constraints between You can define a foreign key constraint with table definition like below. There is a defined relationship with the actor and film actor tables. mysql alter table film actor drop foreign key fk film actor actor Query 

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