Re: insert on conflict postgres returning distinction

how about this solution?
Does it have any caveats?

WITH upsert AS (INSERT INTO GUCIO (ID, NAZWA)
    SELECT A.ID, A.NAZWA
    FROM ALA A
    ON CONFLICT (ID) DO UPDATE SET
        nazwa = excluded.nazwa
    RETURNING xmax,xmin, *)
select xmax as xmax_value
into txmaxu
from upsert;

delete
from gucio
where xmax = (select xmax_value from txmaxu where xmax_value <> 0 limit 1);



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