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The DBMS prevents updates that would cause duplicate key values and thereby ensures that tables always comply with the desired rules for uniqueness.

This is a very specific case where relationship() must perform an INSERT and a second UPDATE in order to properly populate a row (and vice versa an UPDATE and DELETE in order to delete without violating foreign key constraints).

In this case, it’s typically impossible to insert the “widget” and “entry” rows using just two INSERT statements; an UPDATE must be performed in order to keep foreign key constraints fulfilled.

It is highly recommended that an application which seeks to employ natural primary keys with mutable values to use the In those cases when a database that does not support referential integrity is used, and natural primary keys with mutable values are in play, SQLAlchemy offers a feature in order to allow propagation of primary key values to already-referenced foreign keys to a limited extent, by emitting an UPDATE statement against foreign key columns that immediately reference a primary key column whose value has changed.

Values are not combined, they are compared using their data types.

When a column or set of columns is defined as unique to the database management system, the system verifies that each set of values is unique before assigning the constraint.

2) "conditional update" The instead-of trigger checks to see if the PK columns are being altered, and only includes them if appropriate Nothing crashed – but we totally corrupted the child table.

This last example is actually also contained in the standard Oracle docs.

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