> Why you should write a function first and then the trigger, which must > call that function? > > What are the advantages/disadvantages of that? Where can I find more > information? The PG way seems very natural to me: you can write functions that do something and then have many triggers call that same function. Also there's not just PL/PGSQL: you might want to define a function in C or Perl and then have a trigger call it. Bye, Chris. -- Chris Mair http://www.1006.org