Free xxx chat sverige - Updating clause used in instead of trigger example

If you are defining an INSTEAD OF trigger, then you cannot use the UPDATE OF ORDER clause – When defining additional triggers of the same type (insert, update, or delete) to fire at the same time (before, after, or resolve), you must specify an ORDER clause to tell the database server the order in which to fire the triggers.

updating clause used in instead of trigger example-62

Does it mean delete all employees that are in department LCR?

Does it mean set to null the dept_code for employees in department LCR?

With this clause an UPDATE is treated as a delete followed by an insert.

An INSERT takes the REFERENCING NEW clause, which represents the inserted row. A DELETE takes the REFERENCING OLD clause, which represents the deleted row. An UPDATE takes the REFERENCING OLD clause, which represents the row before the update, and it takes the REFERENCING NEW clause, which represents the row after the update.

For statement-level triggers, the REFERENCING OLD and REFERENCING NEW clauses refer to declared temporary tables holding the old and new values of the rows.

FOR EACH clause – To declare a trigger as a row-level trigger, use the FOR EACH ROW clause.

However, if another same-type trigger is already set to 1, then an error is returned.

When adding additional triggers, you may need to modify the existing same-type triggers for the event, depending on whether the actions of the triggers interact.

To learn whether and in what ways the columns of an inherently updatable view can be modified, query the USER_UPDATABLE_COLUMNS data dictionary view.

The information displayed by this view is meaningful only for inherently updatable views.

The OLD and NEW rows can be referenced in BEFORE and AFTER triggers.

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