Re: "SELECT *" vs hidden columns and logical column order

On Sat, Jul 1, 2017 at 6:09 AM, Peter Eisentraut
<peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:
> On 6/28/17 23:52, Thomas Munro wrote:
>> 2. SQL:2011 temporal tables track system time and/or valid time with
>> columns that users create and then declare to be temporal control
>> columns. I don't think they show up unless you name them directly (I
>> didn't check the standard but I noticed that it's that way in another
>> product), so I guess that's basically the same as (1).
>
> In my reading of the standard, those start/end time columns would show
> up normally in SELECT *.

Oh, well that's surprising. I don't have a recent enough SQL standard
to hand, but I saw that a couple of popular RDBMSs with temporal
support understand GENERATED ALWAYS AS ROW { START | END } [[ IMPLICITLY ]
HIDDEN ] where that last bit controls whether SELECT * sees it.

--
Thomas Munro
http://www.enterprisedb.com