jack wrote:
Is that possible to have a two columns primary key on a table with null
value on second column?
Jack
Probably not, because (1,2,null,null) is unique for postresql.
Watch discussion on mailing list
about unique indexes (on which primary key is based) several days ago.
Regards,
On Fri, 24 Jan 2003, jack wrote:
Is that possible to have a two columns primary key on a table with null
value on second column?
No, because primary key implies not null on all columns involved
(technically I think it's that a non-deferrable primary key implies
not null on all columns
Is that possible to have a two columns primary key on a table with null
value on second column?
Jack
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