On Thu, Dec 22, 2005 at 07:22:12PM +0800, zhaoxin wrote:
> Hi All.
>
> I have a question about the Maximum number of columns in a table ?
>
> In FAQ for PostgreSQL,I can find this description :
> Maximum number of columns in a table?
> 250-1600 depending on column types
> But , I want to know what type is 1600 limit , and what type is 250
> limit . it is important for me , thanks .
I'm pretty sure I've read the reason for the limit somewhere in the
source code, but I can't remember where. It's probably somewhere in
http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/. I know
that the exact upper limit isn't actually 1600 fields, it's more like
1643 or something.
But, as others have said, just try creating your table and see what
happens. If it fails, you might be able to get it to work by increasing
the block size.
And as others have said, this is almost certainly a horrible schema that
needs to be fixed, badly. Luckily, thanks to views and rules, you could
probably fix it without actually changing any of the client code.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461