A flat fee, also referred to as a flat rate or a linear rate, refers to a pricing structure that charges a single fixed fee for a service, regardless of usage.[1] Less commonly, the term may refer to a rate that does not vary with usage or time of use.
Synchronous: interrupt occurs as a result of current process, otherwise asynchronous. User requested: interrupt occurs because of direct result by user task, otherwise coerced. Maskable: if desired the interrupt can be disabled by a user task, otherwise unmasked.
DML triggers have four basic timing points for a single table. Before Statement : Trigger defined using the BEFORE keyword, but the FOR EACH ROW clause is omitted. Before Each Row : Trigger defined using both the BEFORE keyword and the FOR EACH ROW clause.