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Should you use cascade delete?
2 Answers. ON DELETE CASCADE is fine, but only when the dependent rows are really a logical extension of the row being deleted. For example, it’s OK for DELETE ORDERS to delete the associated ORDER_LINES because clearly you want to delete this order, which consists of a header and some lines.
What is cascade delete?
CASCADE. It is used in conjunction with ON DELETE or ON UPDATE. It means that the child data is either deleted or updated when the parent data is deleted or updated. It means that the child data is set to NULL when the parent data is deleted or updated. SET DEFAULT.
What is cascade delete option used for?
Notes: Cascade Delete option means that if a record from one table is deleted, corresponding records in the other table are also deleted.
What is the use of Cascade constraints?
ON DELETE CASCADE constraint is used in MySQL to delete the rows from the child table automatically, when the rows from the parent table are deleted. For example when a student registers in an online learning platform, then all the details of the student are recorded with their unique number/id.
How does Cascade delete from parent to child?
This should cascade to the parent table and remove the record. Foreign keys only work in the other direction: cascade deletes from parent to child, so when the parent (referenced) record is deleted, any child (referencing) records are also deleted.
How to delete children records when deleting parent?
The opposite way of dealing with situation is to delete children records, when deleting parent. For that, there is a great Laravel package called Cascade Soft Deletes. All we need to do is install it:
Can a foreign key delete a parent table?
This should cascade to the parent table and remove the record. 3 Answers 3. Foreign keys only work in the other direction: cascade deletes from parent to child, so when the parent (referenced) record is deleted, any child (referencing) records are also deleted.
How are cascading transactions configured in a system?
Certain transactions can be configured to cascade across all related records. This means the change on a parent record will be transacted upon (cascade down through) all the child records. Cascading relationships are configured at the entity level.