Nobody knows? Nobody has any idea?
Greetings. Walter. On Thu, Aug 20, 2015 at 10:45 AM, Walter R. Ojeda Valiente < sistemas2000profesio...@gmail.com> wrote: > Hello everybody > > For add a Primary Key to a table we can write: > > ALTER TABLE MyTable ADD PRIMARY KEY (ID); > > or we can write: > > ALTER TABLE MyTable ADD CONSTRAINT MyPK PRIMARY KEY (ID); > > In the first case, the Firebird puts the name of the Primary Key, in the > second case we choose that name, but... > > Why sometimes the first case fails and the second case always work? > > Of course that the table has not a Primary Key yet and the ID column has > not nulls neither duplicated values. > > But (just sometimes) the first case fails. > > Greetings. > > Walter. > >
