Triggers can be defined for INSERT, DELETE, and UPDATE operations on valid-time tables.
Note the following restriction:
For BEFORE triggers, defined actions cannot reference the component beginning or ending
bound DateTime columns of the valid-time derived period column.
The DELETE or UPDATE operation that triggers an action can be unqualified or can include
the temporal FOR PORTION OF qualifier.
Actions for DELETE and UPDATE triggers on ANSI temporal tables can be qualified with
FOR PORTION OF.