Column in having clause does not exist issue in Doctrine and pgadmin - postgresql

Question

I am running a query in pgadmin but facing issue column distance does not exist
select f.title, f.longitude, f.latitude, (3959 * cos(cos(radians('52.512452')) * cos(radians(latitude)) * cos(radians(longitude) - radians('13.390931')) + sin(radians('52.512452')) * sin(radians(latitude)))) AS distance from fitness_studio f having distance<1 order by distance desc
Thanks in advance for any help.
Regards,
Aisha

Answer 1

As far as I know postgresql has no way to directly use an alias column in where clause. So you should either try to duplicate the logic:
SELECT
f.title,
f.longitude,
f.latitude,
(3959 * cos(cos(radians('52.512452')) * cos(radians(latitude)) * cos(radians(longitude)
- radians('13.390931')) + sin(radians('52.512452')) * sin(radians(latitude)))) AS distance
FROM fitness_studio f
WHERE (3959 * cos(cos(radians('52.512452')) * cos(radians(latitude)) *
cos(radians(longitude) - radians('13.390931')) +
sin(radians('52.512452')) * sin(radians(latitude)))) < 1
ORDER BY distance DESC
either to use a subquery:
WITH container AS (
SELECT
f.title,
f.longitude,
f.latitude,
(3959 * cos(cos(radians('52.512452')) * cos(radians(latitude)) *
cos(radians(longitude) - radians('13.390931')) +
sin(radians('52.512452')) * sin(radians(latitude)))) AS distance
FROM fitness_studio f)
SELECT *
FROM container
WHERE distance < 1
ORDER BY distance DESC
Please keep in mind that using such subquery may negatively affect execution plan and when your table is large enough execution speed becomes more important than query awkwardness.
PS: Note that ORDER BY may correctly get alias as parameter. Suppose it's cause ORDER BY doesn't affect selected rows, it just rotates them. Same picture with GROUP BY