On 24/03/17 21:42, Vlad Khorsun wrote: > 24.03.2017 21:36, Lester Caine wrote: >> On 24/03/17 17:57, Vlad Khorsun wrote: >>>> What must be done is specified exactly. And we should suppose that in >>>> all other aspects data stored in database should not be changed - >>> What data is *stored* ? >> For any field, the data that is loaded initially or later modified. And >> I REPEAT ... if the field was originally NULL it should remain NULL >> until a specific record update modifies it. It should not be returning >> some DEFAULT value that was added later UNLESS the constraints are >> changed to require the NULL value to be populated, but that should not >> be populated 'magically' and the SQL spec does not override that basic >> function of a value in an existing record? The DEFAULT value should only >> be used to replace a NULL value when a record is added ... full stop.
> Engine substitute default value if and only if NOT NULL field was added > and DEFAULT value was specified. Engine not allow to add NOT NULL field > without DEFAULT. If NULLable field was added engine will return NULL's > for that field at existing old records despite of precence of DEFAULT value. > > Is it OK ? That is what I would expect to see ... As I stated in SET's reply I would expect to manage the change of a default as appropriate, but the fall back should always be the stored values? You would only see a 'new' default value if you added it, not if you simply changed the metadata? -- Lester Caine - G8HFL ----------------------------- Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk Rainbow Digital Media - http://rainbowdigitalmedia.co.uk ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
