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BEFORE UPDATE trigger also fires at insert?

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Hi,

I've defined a small trigger to increment a field each time the row is updated:

> CREATE TRIGGER inc_trigger BEFORE UPDATE ON Table FOR EACH ROW EXECUTE PROCEDURE inc_function();

Works quite well, however the trigger is also fired if the table
itself is modified.
When deleting or inserting a single row, the trigger is executed for
all rows contained in the table.

Is this intetional, and if so, how can I get the behaviour to only
execute the trigger when an update on the relation is performed?

Thank you in advance, Clemens

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