GDA: empty PostgreSQL table failed workaround
nbinont at gmail.com
Thu Feb 14 13:10:40 EST 2008
On Thu, Feb 14, 2008 at 12:45 PM, Derek Atkins <warlord at mit.edu> wrote:
> Mark Johnson <mrj001 at shaw.ca> writes:
> > Phil Longstaff wrote:
> >> The slot_id is used to provide a unique primary key. I don't know if
> >> would work to have the slots table have *no* key, but have an index on
> >> the obj_guid field. The obj_guid field can't be the primary key
> >> I believe a primary key needs to be unique. Mark?
> > Yes, a primary key does have to be unique. I can't think of any
> > requirement that a table have a primary key though. It is generally
> > good practice. You could have an index on the guid field.
> I think the question was more: Does every table have to HAVE
> a primary key?
no. The SQL spec does not require a primary key.
Yes, the primary key must be unique, but what
> if a table has no primary key? Is that still okay?
yes, it is ok, though performance will usually suffer.
> Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
> Member, MIT Student Information Processing Board (SIPB)
> URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
> warlord at MIT.EDU PGP key available
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