Steve Crawford <scrawford@xxxxxxxxxxxxxxxxxxxx> writes: > On 04/07/2011 11:29 AM, Tom Lane wrote: >> Steve Crawford<scrawford@xxxxxxxxxxxxxxxxxxxx> writes: >>> 1. Where can I read up on the purpose and properties of a data-type of >>> unknown? >> It's the type initially imputed to unadorned string literals and NULL... > Is there a place in the documentation that explains this? I haven't > found it so far. Probably not --- it's normally just an implementation detail. >> ...It can be cast to anything, but that's a hardwired behavior not >> something listed in pg_cast. > Hmmm. Not *anything* - at least not directly: Unadorned string literals and NULL constants can be cast to anything. Once it's not a simple constant anymore, you can't do anything at all with 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
