How can I run subqueries in mysql - mysql

Question

I am trying to run subqueries from another table in a query
My Query is as follows:
SELECT *, (6371000 * acos(cos(radians(select point_oi.lng
from point_oi
where point_oi.name like '%Main Square%')
)
* cos(radians(restaurants.lat)) * cos(radians(restaurants.lng)
- radians(select point_oi.lng
from point_oi
where point_oi.name like '%Main Square%'
))
+ sin(radians(select point_oi.lng
from point_oi
where point_oi.name like '%Main Square%'))
* sin(radians(restaurants.lat)))) AS distance
FROM restaurants
HAVING distance < 500;
When I run the Query I get an error saying that there is an error near select.
I would like to use the nested select queries to get the lat and lng from another table rather than hardcoding the values.
How can I fix this.
Thank you for your help

Answer 1

You should not use subquery for retrieve point_poi lat, lnt if the suquery return more than a rows you have error ..
try use a proper join (in this case do the fatc you have not relation between point_poi and restaurants you could use cross join )
SELECT restaurants.*,
(6371000 * acos(cos(radians(point_oi.lng ))
* cos(radians(restaurants.lat)) * cos(radians(restaurants.lng)
- radians(point_oi.lng ))
+ sin(radians(point_oi.lng ))
* sin(radians(restaurants.lat)))) AS distance
FROM restaurants
CROSS JOIN point_oi
WHERE point_oi.name like '%Main Square%'
AND (6371000 * acos(cos(radians(point_oi.lng ))
* cos(radians(restaurants.lat)) * cos(radians(restaurants.lng)
- radians(point_oi.lng ))
+ sin(radians(point_oi.lng ))
* sin(radians(restaurants.lat)))) < 500;

Answer 2

Please try this query and let me know is your issue resolve.
SELECT t.*
,(6371000 * acos(cos(radians(SELECT point_oi.lng FROM point_oi WHERE point_oi.name LIKE '%Main Square%')) * cos(radians(restaurants.lat)) * cos(radians(restaurants.lng) - radians(SELECT point_oi.lng FROM point_oi WHERE point_oi.name LIKE '%Main Square%')) + sin(radians(SELECT point_oi.lng FROM point_oi WHERE point_oi.name LIKE '%Main Square%')) * sin(radians(restaurants.lat)))) AS distance
FROM restaurants As t
WHERE distance < 500;