Triggers have no connection with Periodical Executions.
Msdn says:
A trigger is a special kind of stored procedure that automatically executes when an event occurs in the database server.DML triggers execute when a user tries to modify data through a data manipulation language (DML) event. DML events are INSERT, UPDATE, or DELETE statements on a table or view. These triggers fire when any valid event is fired, regardless of whether or not any table rows are affected.
Note that:when an event occurs in the database server
You have to raise an event either manually or automatically.Without particular Event occurance Trigger cannot work.
Periodical executions are different from these things.It Executes at given time Once it is scheduled there is no need to call,raise anything until schedules get completed.
Use
Job Scheduling in sqlserver to call Trigger
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