Обсуждение: summary VIEW

Hi all,

Taking that I have an aircraft seating table, as below,

How could I create a VIEW to replace the capacity table shown underneath?

create table matrix ( matrixaircraft character varying (4) references aircraft(aircraftid) not 
null, matrixrow int4 not null, matrixseat character references seating(seatid), matrixwidth int4 not null, primary key
(matrixaircraft,matrixrow)
 
);

-- capacity should be a VIEW based on matrix
create table capacity ( capaircraft character varying (4) references aircraft(aircraftid) not null, capseat character
referencesseating(seatid) not null, capcount int4, primary key (capaircraft, capseat)
 
);


-- 
Gary Stainburn
This email does not contain private or confidential material as it
may be snooped on by interested government parties for unknown
and undisclosed purposes - Regulation of Investigatory Powers Act, 2000     

I've managed it by doing:

create view capacity as SELECT matrixaircraft AS capaircraft, matrixseat AS capseat,
sum(matrix.matrixwidth)AS capcount    FROM matrix   GROUP BY matrixaircraft, matrixseat;
 

If there's a better way I'l appreciate being shown.

Ta

Gary

On Monday 06 May 2002 12:41 pm, Gary Stainburn wrote:
> Hi all,
>
> Taking that I have an aircraft seating table, as below,
>
> How could I create a VIEW to replace the capacity table shown underneath?
>
> create table matrix (
>   matrixaircraft character varying (4) references aircraft(aircraftid) not
> null,
>   matrixrow int4 not null,
>   matrixseat character references seating(seatid),
>   matrixwidth int4 not null,
>   primary key (matrixaircraft, matrixrow)
> );
>
> -- capacity should be a VIEW based on matrix
> create table capacity (
>   capaircraft character varying (4) references aircraft(aircraftid) not
> null, capseat character references seating(seatid) not null,
>   capcount int4,
>   primary key (capaircraft, capseat)
> );

-- 
Gary Stainburn
This email does not contain private or confidential material as it
may be snooped on by interested government parties for unknown
and undisclosed purposes - Regulation of Investigatory Powers Act, 2000