Обсуждение: Is there a way to replace select * fields in result ?

Hello,

Is there a way to replace select * fileds in result ?
I have select qw.* from table but I want field for example mm to be 
replaced with custom value like:

select qw.*, case whem length(qw.mm) > 0 THEN COALESCE(SUBSTRING(qw.mm, 
1, 1), '') ELSE qw.mm END AS qw.mm

Is there some way to do that ?

Regards,
HS

Hello,

Is there a way to replace select * fileds in result ?
I have select qw.* from table but I want field for example mm to be replaced with custom value like:

select qw.*, case whem length(qw.mm) > 0 THEN COALESCE(SUBSTRING(qw.mm, 1, 1), '') ELSE qw.mm END AS qw.mm

Is there some way to do that ?

On 12-06-2021 11:13, David G. Johnston wrote:
> On Saturday, June 12, 2021, Condor <condor@stz-bg.com> wrote:
>
>>
>> Hello,
>>
>> Is there a way to replace select * fileds in result ?
>> I have select qw.* from table but I want field for example mm to be
>> replaced with custom value like:
>>
>> select qw.*, case whem length(qw.mm) > 0 THEN
>> COALESCE(SUBSTRING(qw.mm,
>> 1, 1), '') ELSE qw.mm END AS qw.mm
>>
>> Is there some way to do that ?
>>
>>
> No.  If you don’t want a column from “*” to appear in the output you
> cannot
> use “*”.  In general, for production, you should avoid “*” anyway.
>
> David J.

Uh .. yes I know. I trying to revisit old procedures from team that left
the project ... and it's seems they use select * to a lot of places.

Thanks,

> On 12 Jun 2021, at 10:00, Condor <condor@stz-bg.com> wrote:
>
> select qw.*, case whem length(qw.mm) > 0 THEN COALESCE(SUBSTRING(qw.mm, 1, 1), '') ELSE qw.mm END AS qw.mm

A little off-topic, but isn’t that a roundabout way of writing just this?:

    select qw.*, coalesce(substring(qw.mm, 1, 1), '') as mm

Or even:

    select qw.*, coalesce(left(qw.mm, 1), '') as mm


Regards,

Alban Hertroys
--
There is always an exception to always.