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Mysql can parse the foreign key syntax for the myisam table type (meaning no error message will be raised if it encounters an fk definition), making migration from other database products or table engines easier because you do not have to edit the create table statements to remove them.
8 kwi 2019 · REFERENCED_TABLE_NAME = 'airports'; -- <table> flights, carriers, planes. Show all the foreign keys pointing FROM 'mytable': SELECT * FROM information_schema.TABLE_CONSTRAINTS. WHERE information_schema.TABLE_CONSTRAINTS.CONSTRAINT_TYPE = 'FOREIGN KEY'.
MySQL Workbench Manual. Preface and Legal Notices. General Information. Installation. Configuration. Home Screen Tab. Connections in MySQL Workbench. Administrative Tasks. Performance Tools. Database Development. Database Design and Modeling. ... C.6.2 Tutorial: Generating Foreign Keys with MyISAM ...
MySQL FOREIGN KEY Constraint. The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.
The recommended engine to use foreign keys is InnoDB, and honestly, for 99% of cases InnoDB is better. You can easily change all your database to use InnoDB instead of MyISAM: add default_storage_engine = InnoDB to /etc/mysql/my.cnf (or equivalent)
My question is: does it still make sense to define foreign keys etc while creating the tables so as to prepare it for future use with InnoDB, or should I in this case rely entirely upon my coding for data integrity and just be happy with the different tables being completely oblivious of each other's existence and relevance?
MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent. A foreign key relationship involves a parent table that holds the initial column values, and a child table with column values that reference the parent column values.
