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Procedural code automatically executed in response to a database event.

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If you dont want the update trigger to be executed when the its called from within the insert trigger, you can surround your statements with a condition of pg_trigger_depth() which returns the depth … , which wont be 0 when you are running the trigger directly/indirectly from another trigger. So, within your function gener_history(), you can do something like this IF pg_trigger_depth() = 1 THEN …
answered Jun 7 '15 by Akash