Oracle trigger inserting updating deleting

Oracle Database automatically executes a trigger when a specified event takes place, which may be in the form of a system event or a DML statement being issued against the table.Triggers can be: Trigger names must be unique with respect to other triggers in the same schema.

Because the trigger uses the clause, it might be executed multiple times, such as when updating or deleting multiple rows.

If you create the GTT (global temporary table) with the default "on commit delete rows" option, you don't have to worry about cleaning up this table after processing the rows - that will happen automatically.

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