Aaron Bono wrote: > > > On 7/10/06, *Bryce Nesbitt* <bryce1@obviously.com > <mailto:bryce1@obviously.com>> wrote: > > > I think it is ugly also, but no other syntax seems to work: > > stage=# select > pod_code,lat,lon,calculate_distance(lat,lon,37.789629,-122.422082) as > dist from eg_pod where dist < 1 order by dist desc limit 10; > ERROR: column "dist" does not exist > > > SELECT > pod_code, > lat, > lon, > calculate_distance(lat,lon,37.789629,-122.422082) as dist > FROM eg_pod > WHERE calculate_distance(lat,lon, 37.789629,-122.422082) < 1 > ORDER BY calculate_distance(lat,lon,37.789629,-122.422082) desc limit 10; Yep, that works. I guess with IMMUTABLE it's even effecient. But I have to pass 6 arguments, not 2. Is there a way to make it look cleaner? I had expected using the column label (e.g. "dist") to work with WHERE, just as it does with ORDER BY.
You can also try
SELECT
pod_code, lat, lon, dist
FROM ( SELECT
pod_code, lat, lon, calculate_distance(lat,lon,37.789629,-122.422082) as dist
FROM eg_pod ) eg_prod WHERE dist < 1 ORDER BY dist desc limit 10;
If the 37.789629 and -122.422082 are static values you can create a view for it. Otherwise you can create a function or stored procedure that takes 2 arguments and returns the results of the subquery.
Just some options. Not sure which you would prefer. I am sure there are more ways to do it.
