>>My situation is that I'm reading data from an external website with lots
of duplicate data. I am reading the data in a plpythonu function. I never
update, only insert. A trigger on the table that has to check if each row
exists before trying the insert is too much overhead.
Create a staging table into which you import your external data and then
write a query of the form "INSERT INTO realtable SELECT FROM stagingtable
WHERE stagingtable NOT EXISTS realtable".
David J.
