Mysql Myisam Foreign Key Support

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C.6.2 Tutorial: Generating Foreign Keys with MyISAM - MySQL

    https://dev.mysql.com/doc/workbench/en/wb-tutorial-plugins-myisam-fk.html
    In this case, relationship lines between foreign keys in the table will automatically be drawn. This graphical representation makes the relationships between the tables much easier to understand. However, the older MyISAM storage engine does not include support for foreign keys.

MySQL: Foreign Keys between InnoDB and MyISAM · ... and ...

    https://nick.zoic.org/art/mysql-foreign-key-error/
    Putting foreign keys between InnoDB and MyISAM should be disallowed at schema-change time (the create table should fail) because MyISAM doesn’t support foreign keys. But it is allowed if foreign keys checks are switched off:

Why partitioned table in innodb doesn't support foreign key?

    https://stackoverflow.com/questions/55913170/why-partitioned-table-in-innodb-doesnt-support-foreign-key
    I tried to add a Foreign Key for a partitioned table in MySQL and I got the following error: ERROR 1506 (HY000): Foreign keys are not yet supported in conjunction with partitioning. Why does InnoDB partitioning not support Foreign Keys? Is there a workaround?

MySQL :: MySQL 8.0 Reference Manual :: 16.2 The MyISAM ...

    https://dev.mysql.com/doc/en/myisam-storage-engine.html
    In MySQL 8.0, the MyISAM storage engine provides no partitioning support. Partitioned MyISAM tables created in previous versions of MySQL cannot be used in MySQL 8.0. For more information, see Section 23.6.2, “Partitioning Limitations Relating to Storage Engines”.

MySQL :: MySQL 5.7 Reference Manual :: 1.8.2.3 FOREIGN KEY ...

    https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-foreign-keys.html
    The MySQL implementation of foreign key constraints differs from the SQL standard in the following key respects: If there are several rows in the parent table with the same referenced key value, InnoDB performs a foreign key check as if the other parent rows with the same key value do not exist.

MySQL :: MySQL 5.6 Reference Manual :: 15.2 The MyISAM ...

    https://dev.mysql.com/doc/refman/5.6/en/myisam-storage-engine.html
    MyISAM supports concurrent inserts: If a table has no free blocks in the middle of the data file, you can INSERT new rows into it at the same time that other threads are reading from the table. A free block can occur as a result of deleting rows or an update of a dynamic length row with more data than its current contents.

MySQL Lists: mysql: Re: MyISAM vs InnoDB + Foreign Keys

    https://lists.mysql.com/mysql/165387
    MyISAM is so much faster because it doesn't have to deal with the overhead of transactions and foreign keys. An important aspect of foreign keys is the referential action (ON DELETE CASCADE, ON UPDATE SET NULL, etc) which allow you to have the database take care of cascading actions when a parent row is deleted without having to worry about having an application programmer do it and make a coding …

MyISAM and foreign key support - SearchDataCenter

    https://searchdatacenter.techtarget.com/answer/MyISAM-and-foreign-key-support
    MyISAM and foreign key support. Share this item with your network: Published: 07 Oct 2004. Are foreign key constraints supported in MyISAM of MySQL? I have created a table using InnoDB, declaring the foreign key, and now I want to convert that table to MyISAM. Is it …

MySQL :: MySQL 5.6 Reference Manual :: 13.1.17.6 FOREIGN ...

    https://dev.mysql.com/doc/refman/5.6/en/create-table-foreign-keys.html
    For storage engines that support foreign keys, MySQL rejects any INSERT or UPDATE operation that attempts to create a foreign key value in a child table if there is no matching candidate key value in the parent table.. For an ON DELETE or ON UPDATE that is …



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