Simple synchronous D flip-flop circuit

CSTLS5M00G56-A0-D

Photocoupler

A trigger is a special stored procedure whose execution is not called by the program, nor is it started manually, but is triggered by an event, such as when a table is manipulated ( iNSert, delete, update). carried out. Triggers are often used to enforce data integrity constraints and business rules.
The advantage of triggers is that triggers can implement cascading changes through related tables in the database; however, these changes can be performed more efficiently by cascading referential integrity constraints. Triggers can enforce more complex constraints than those defined with CHECK constraints. Unlike CHECK constraints, triggers can reference columns in other tables. Triggers can also evaluate the state of the table before and after data modification and take countermeasures based on their differences. Multiple similar triggers (INSERT, UPDATE, or DELETE) in a table allow multiple different countermeasures to be taken in response to the same modified statement.