having子句中的未知聚合列

Question

im trying to build a location based event search in PHP + MySQL (Using Laravel and its Eloquent ORM)

This is the query I am using:

select 
    events.*, 
    ( 3959 * acos( cos( radians(50.5) ) * cos( radians( addresses.latitude ) ) * cos( radians( addresses.longitude ) - radians(9.50) ) + sin( radians(50.5) ) * sin( radians( addresses.latitude ) ) ) ) AS distance

 from 
    `events` inner join `addresses` on `events`.`address_id` = `addresses`.`id`
 having 
    `distance` <= 10 
 order by 
    `id` desc limit 15 offset 0

Im wondering why this error pops up, even though the distance column is in the "select statement".

"SQLSTATE[42S22]: Column not found: 1054 Unknown column 'distance' in 'having clause' (SQL: select count(*) as aggregate from `events` inner join `addresses` on `events`.`address_id` = `addresses`.`id` having `distance` <= 10 order by `id` desc)"

This is the PHP Code I use to add the scope to the base query:

    $selectDistance =
        '( 3959 * acos( cos( radians(' . $latitude . ') ) ' .
        '* cos( radians( addresses.latitude ) ) ' .
        '* cos( radians( addresses.longitude ) - radians(' . $longitude . ') ) ' .
        '+ sin( radians(' . $latitude . ') ) ' .
        '* sin( radians( addresses.latitude ) ) ) ) AS distance';

    $query->select(DB::raw('events.*, ' . $selectDistance));
    $query->join('addresses', 'events.address_id', '=', 'addresses.id');
    $query->having('distance', '<=', $km);

Thank you very much :)

Answer 1

From the error message:

"SQLSTATE[42S22]: Column not found: 1054 Unknown column 'distance' in 'having clause' (SQL: select count(*) as aggregate from events inner join addresses on events.address_id = addresses.id having distance <= 10 order by id desc)"

We can get the following

SQL:

select count(*) as aggregate 
from `events` inner join `addresses` on `events`.`address_id` = `addresses`.`id` 
having `distance` <= 10 
order by `id` desc

distance is not in the select list.