On Tue, Oct 26, 2021 at 6:36 AM Marcos Pegoraro <mar...@f10.com.br> wrote:
> >> Maybe converting new and old records to json and text > PERFORM * FROM (select ID, row_to_json(O.*)::text Old_Values, > row_to_json(N.*)::text New_Values from old_table o full outer join > new_table N using(ID) where Old_Values is distinct from New_Values) as > differences LIMIT 1; > I have done this, but with casting to jsonb, which already supports the equality operator. Saved an extra cast to text. Also allows for easily excluding a column or two before comparing. I never noticed a performance problem, but I was using this technique to see if a row had substantively changed, and if so, to cancel the write and subsequent trigger invocations by returning NULL in the before-trigger. The trade off of conversions to jsonb by not writing and performing subsequent processing/writes due to later triggers was an obvious win for me, but your mileage may vary depending on your use case.
