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How to create trigger for multiple rows in DML?
You can change the trigger to use the method optimal for the number of rows. For example, the @@ROWCOUNT function can be used in the logic of the trigger to distinguish between a single and a multirow insert. — Trigger valid for multirow and single row inserts — and optimal for single row inserts.
Can a single row trigger be used for multiple rows?
However, with this trigger the correlated subquery and the IN operator that is used in the WHERE clause require additional processing from SQL Server. This is unnecessary for a single-row insert. You can change the trigger to use the method optimal for the number of rows.
Why are there multiple triggers in SQL Server?
Keeping each “behavior” in one place reduces the chances of forgetting to update logic that’s been duplicated across three separate insert, update, and delete triggers. The biggest pitfall with triggers is that the INSERTED and DELETED tables are not indexed, and you can’t index them directly.
Is there an insert trigger in table name?
The behavior is less common for INSERT triggers because the basic INSERT statement adds only a single row. However, because an INSERT trigger can be fired by an INSERT INTO (table_name) SELECT statement, the insertion of many rows may cause a single trigger invocation.
Can a table name Trigger be fired in DML?
However, because an INSERT trigger can be fired by an INSERT INTO ( table_name) SELECT statement, the insertion of many rows may cause a single trigger invocation.
How to create triggers that affect multiple rows?
To design a trigger that affects multiple rows, use rowset-based logic instead of cursors. The DML triggers in the following examples are designed to store a running total of a column in another table of the AdventureWorks2012 sample database.
How many triggers are there for a task?
A given task can be started by one or more triggers. A task can have a maximum of 48 triggers. Time-based triggers start tasks at specified times. This includes starting the task once at a specific time or starting the task multiple times on a daily, weekly, monthly, or monthly day-of-week schedule.
How are triggers defined in Task Scheduler 1.0?
In Task Scheduler 1.0, multiple triggers can be thought of as a schedule, a set of times at which the task starts. In this case, the schedule is the set of times (specified by the union of all of the triggers associated with the work item) at which a work item will execute.