Good explanation of cascade (ON DELETE/UPDATE) behavior
Jun 20, 2013 · 51 For example, if I have two tables - Parent and Child - where Child records are owned by Parent records, which table needs the ON DELETE CASCADE? ON DELETE CASCADE is an …
Difference between On Delete Cascade & On Update Cascade in mysql
Aug 22, 2014 · 1) ON DELETE CASCADE means if the parent record is deleted, then any referencing child records are also deleted. ON UPDATE defaults to RESTRICT, which means the UPDATE on …
Is it a good or bad idea to use "ON UPDATE CASCADE ON DELETE …
Dec 2, 2019 · The question on when to cascade delete, when to restrict delete, is an interesting one, and I haven't figured out a definitive answer yet. Informally I'm thinking in terms of how important is …
Disadvantages to using ON DELETE CASCADE on every foreign key?
Sep 9, 2020 · 5 Our application currently has "soft delete" built-in to most tables with a BIT "deleted" column. There is now a requirement for "hard delete" functionality. Are there any disadvantages, …
DROP TABLE ... CASCADE does not drop any dependent table
Oct 7, 2015 · CASCADE on the referenced table does in fact remove the rows in the other tables EDIT: Ok, I understand it does this because this is the way it has been specified by the documentation, but …
Solving ON DELETE CASCADE cycles with triggers on MS SQL Server
Oct 23, 2019 · As SQL Server can refuse to create ON DELETE CASCADE constraints due to potential cycles, I decided to just indicate the FOREIGN KEY constraint and then have each table referencing …
Can I enforce cascade delete in a delete from statement?
Mar 1, 2018 · 4 I am using constraints in a database meaning that records of a certain table cannot be removed lightly. That is normally the desired case. However, is there a way to write a DELETE …
sql server - Temporarily turn on Cascade Delete - Database ...
May 20, 2022 · SQL Server doesn't let you ALTER CONSTRAINT to alter an existing constraint to cascade on delete. However, SQL Server will happily let you create identical Foreign Key constraints.
Using Foreign Key and References for ON DELETE CASCADE in mysql
PRIMARY KEY(id), FOREIGN KEY(parent_id) REFERENCES parent_table(parent_id) ON DELETE CASCADE ); but when deleting a record from parent table, the corresponding record in table child2 …
postgresql - "ON UPDATE" in self referencing table - Database ...
Jun 13, 2023 · I have a table Category with a parent_id column referencing the self id column, for this, I used "ON DELETE CASCADE" meaning if the parent is deleted, other children would be deleted too.