Sterpu Victor <vic...@caido.ro> wrote: > Hello > > I have this concat: > CONCAT(f.nrfo, '/', TO_CHAR(fd1.validfrom, 'YYYY-MM-DD'), f2.nrfo, TO_CHAR > (fd7.validfrom, 'YYYY-MM-DD'), DATE(fd5.validto)-DATE(fd1.validfrom)) > that works fine but when I change to this(I added a ' with '): > ARRAY_AGG(CONCAT(f.nrfo, '/', TO_CHAR(fd1.validfrom, 'YYYY-MM-DD'), ' with ', > f2.nrfo, TO_CHAR(fd7.validfrom, 'YYYY-MM-DD'), DATE(fd5.validto)-DATE > (fd1.validfrom))) AS temp, > then concat returns NULL. > Why? I tried to add ' with '::VARCHAR and ' with '::TEXT but the result is > still NULL. > > Thank you
NULL concat with a value returns NULL. You can avoid that using COALESCE(value, ''), that returns the value, or, if the value NULL, ''. Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889° -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
