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https://dev.mysql.com/doc/refman/8.0/en/constraint-foreign-key.html
Since MySQL does not support deferred constraint checking, ... MySQL requires that foreign key columns be indexed; if you create a table with a foreign key constraint but no index on a given column, an index is created. ... InnoDB and NDB tables support foreign keys. PREV HOME UP NEXT . Related Documentation. MySQL 8.0 Release Notes MySQL 8.0 ...
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 …
https://dev.mysql.com/doc/refman/5.7/en/constraint-foreign-key.html
Foreign keys let you cross-reference related data across tables, and ... MySQL requires that foreign key columns be indexed; if you create a table with a foreign key constraint but no index on a given column, an index is created. ... InnoDB and NDB tables support foreign keys. See Section 14.6.1.5, “InnoDB and FOREIGN KEY Constraints ” ...
https://dev.mysql.com/doc/mysql-tutorial-excerpt/5.7/en/example-foreign-keys.html
In MySQL, InnoDB tables support checking of foreign key constraints. See The InnoDB Storage Engine, and FOREIGN KEY Constraint Differences. A foreign key constraint is not required merely to join two tables. For storage engines other than InnoDB, it is possible when defining a column to use a REFERENCES tbl_name(col_name) clause, which has no actual effect, and serves only as a memo …
https://dev.mysql.com/doc/refman/5.5/en/ansi-diff-foreign-keys.html
MySQL accepts REFERENCES clauses only when specified as part of a separate FOREIGN KEY specification. For storage engines that do not support foreign keys (such as MyISAM), MySQL Server parses and ignores foreign key specifications.
https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-foreign-keys.html
A FOREIGN KEY constraint that references a non-UNIQUE key is not standard SQL but rather an InnoDB extension. The NDB storage engine, on the other hand, requires an explicit unique key (or primary key) on any column referenced as a foreign key.
https://dev.mysql.com/doc/refman/8.0/en/create-table-foreign-keys.html
NDB requires an explicit unique key (or primary key) ... In MySQL, foreign key constraints are checked immediately, ... 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.
https://stackoverflow.com/questions/14876649/foreign-keys-with-mysql-cluster-ndb
Since version 7.3 MySQL Cluster should be capable of foreign key constraints. ... Is there any rule that says "with the NDB storage engine you cannot reference a primary key column in a foreign key constraint" or "with NDB you have to reference UNIQUE KEYS in foreign key constraints"? ... An important difference to note with the Foreign Key ...
https://forums.mysql.com/read.php?10,170826,170826
Sep 02, 2007 · I figured out that in MySQL you just replace CONSTRAINT with FOREIGN KEY, like this: ALTER TABLE `app_config` DROP FOREIGN KEY `FK_app_config` but how do I check if the foreign key exists in the first place? Thanks.
https://www.mysql.com/de/products/cluster/nosql.html
MySQL NDB Cluster: NoSQL ... MySQL Cluster enables users to blend the best of both relational and NoSQL technologies into solutions that reduce cost, risk and complexity including: ... ACID compliance, Foreign Key constraints (enforced on all APIs) and support for complex queries;
https://stackoverflow.com/questions/14876649/foreign-keys-with-mysql-cluster-ndb
Since version 7.3 MySQL Cluster should be capable of foreign key constraints. ... Is there any rule that says "with the NDB storage engine you cannot reference a primary key column in a foreign key constraint" or "with NDB you have to reference UNIQUE KEYS in foreign key constraints"? ... An important difference to note with the Foreign Key ...
https://dev.mysql.com/doc/refman/8.0/en/constraint-foreign-key.html
SET DEFAULT is also supported by the MySQL Server but is currently rejected as invalid by InnoDB. Since MySQL does not support deferred constraint checking, NO ACTION is treated as RESTRICT. For the exact syntax supported by MySQL for foreign keys, see Section 13.1.20.6, “FOREIGN KEY …
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-foreign-keys.html
MySQL accepts REFERENCES clauses only when specified as part of a separate FOREIGN KEY specification. For storage engines that do not support foreign keys (such as MyISAM), MySQL Server parses and ignores foreign key specifications.
https://dev.mysql.com/doc/mysql-tutorial-excerpt/5.7/en/example-foreign-keys.html
In MySQL, InnoDB tables support checking of foreign key constraints. See The InnoDB Storage Engine, and FOREIGN KEY Constraint Differences. A foreign key constraint is not required merely to join two tables. For storage engines other than InnoDB, it is possible when defining a column to use a REFERENCES tbl_name(col_name) clause, which has no actual effect, and serves only as a memo …
https://dev.mysql.com/doc/refman/5.7/en/constraint-foreign-key.html
Foreign keys let you cross-reference related data across tables, and ... MySQL requires that foreign key columns be indexed; if you create a table with a foreign key constraint but no index on a given column, an index is created. ... InnoDB and NDB tables support foreign keys. See Section 14.6.1.5, “InnoDB and FOREIGN KEY Constraints ” ...
https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-foreign-keys.html
MySQL accepts REFERENCES clauses only when specified as part of a separate FOREIGN KEY specification. For storage engines that do not support foreign keys (such as MyISAM), MySQL Server parses and ignores foreign key specifications.
https://bugs.mysql.com/bug.php?id=67492
Description: Currently InnoDB does not support foreign keys on partitioned tables. NDB has no such limitation. MySQL is incorrectly applying this rule preventing partitioned tables to have foreign keys against NDB also. However is doing so inconsistently causing a potential problem for restore.
https://docs.oracle.com/cd/E17952_01/mysql-5.6-en/create-table-foreign-keys.html
MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent.
https://forums.mysql.com/read.php?10,170826,170826
Sep 02, 2007 · I figured out that in MySQL you just replace CONSTRAINT with FOREIGN KEY, like this: ALTER TABLE `app_config` DROP FOREIGN KEY `FK_app_config` but how do I check if the foreign key exists in the first place? Thanks.
https://dev.mysql.com/doc/refman/5.6/en/create-table-foreign-keys.html
MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent.
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