"David G. Johnston" <david.g.johnston@xxxxxxxxx> writes: > On Sun, Mar 12, 2017 at 12:00 AM, vod vos <vodvos@xxxxxxxx> wrote: >> The INSERT action still can be done. What I want is just how to limit the >> length of the insert value, you can just type format like 59.22, only four >> digits length. > length(trunc(goose, 0)::text) + scale(goose) > I suspect you might encounter some issues, namely around > 123.456789::numeric(6,1) casting behavior and maybe > 00059.12000::numeric(6,1) treatment of unimportant zeros. Yeah. I wonder if the OP wouldn't be better off thinking of his data as strings rather than numbers. The format requirement could be expressed as a CHECK constraint, along the lines of length(goose) = 5 AND goose ~ '^\d+\.\d+$' (or possibly \d* if zero digits on one side of the decimal point is OK). You could imagine storing as numeric and having CHECK constraints that cast to string and make those tests, but I fear trailing zeroes would break it. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
