How to implement HAVING clause with AND KEYWORD in MYSQL Query - mysql

Question

I am making an application where Item will be delivered from one place to another. The database saves the sending location or address (along with the sending latitude and longitude) and the receiving address or location(along with the destination latitude and longitude).
I am making a search application which will receive data like
sending_latitude $Flat
Sending_longitude $Flon
Destination_latitude $Tlat
Destination_longitude $Tlon
From_date $date
Radius $r
Then it will search the item list to find the locations of the points within the specified radius parameter of the given geographic position and having the date matching from_date.
My Query:
SELECT *, (
6371 *
acos(
cos( radians( $Flat ) ) *
cos( radians( `sending_from_latitude` ) ) *
cos(
radians( `sending_from_longitude` ) - radians( $Flon )
) +
sin(radians($Flat)) *
sin(radians(`sending_from_latitude`))
)
) `senddistance`, (
6371 *
acos(
cos( radians( $Tlat ) ) *
cos( radians( `sending_to_latitude` ) ) *
cos(
radians( `sending_to_longitude` ) - radians( $Tlon )
) +
sin(radians($Tlat)) *
sin(radians(`sending_to_latitude`))
)
) `todistance`
FROM `items` as Item
HAVING (`senddistance` < $rad AND `todistance` < $rad)
ORDER BY `senddistance`
It's working fine as anticipated. However, I want to add another conditing AND from_date = $date in the Conditions.
So I wrote the query like this:
Modified Query:
SELECT *, (
6371 *
acos(
cos( radians( $Flat ) ) *
cos( radians( `sending_from_latitude` ) ) *
cos(
radians( `sending_from_longitude` ) - radians( $Flon )
) +
sin(radians($Flat)) *
sin(radians(`sending_from_latitude`))
)
) `senddistance`, (
6371 *
acos(
cos( radians( $Tlat ) ) *
cos( radians( `sending_to_latitude` ) ) *
cos(
radians( `sending_to_longitude` ) - radians( $Tlon )
) +
sin(radians($Tlat)) *
sin(radians(`sending_to_latitude`))
)
) `todistance`
FROM `items` as Item
WHERE from_date = $date
HAVING (`senddistance` < $rad AND `todistance` < $rad)
ORDER BY `senddistance`
It just simply returns empty result.
What am I doing wrong?

Answer 1

Have you tried to replace HAVINGwith WHERE?
HAVINGis typically used for filtering after you applied GROUP BY
WHEREfilters results before grouping

Answer 2

if the condition is for the query you must add where
You don't need the () around the having condition for this case
SELECT *, (
6371 *
acos(
cos( radians( $Flat ) ) *
cos( radians( `sending_from_latitude` ) ) *
cos(
radians( `sending_from_longitude` ) - radians( $Flon )
) +
sin(radians($Flat)) *
sin(radians(`sending_from_latitude`))
)
) `senddistance`, (
6371 *
acos(
cos( radians( $Tlat ) ) *
cos( radians( `sending_to_latitude` ) ) *
cos(
radians( `sending_to_longitude` ) - radians( $Tlon )
) +
sin(radians($Tlat)) *
sin(radians(`sending_to_latitude`))
)
) `todistance`
FROM `items` as Item
WHERE from_date = $date
HAVING `senddistance` < $rad AND `todistance` < $rad
ORDER BY `senddistance`
In the condition is for filtering the result after group by then you can add the condition in having clause and however you don't need ()
SELECT *, (
6371 *
acos(
cos( radians( $Flat ) ) *
cos( radians( `sending_from_latitude` ) ) *
cos(
radians( `sending_from_longitude` ) - radians( $Flon )
) +
sin(radians($Flat)) *
sin(radians(`sending_from_latitude`))
)
) `senddistance`, (
6371 *
acos(
cos( radians( $Tlat ) ) *
cos( radians( `sending_to_latitude` ) ) *
cos(
radians( `sending_to_longitude` ) - radians( $Tlon )
) +
sin(radians($Tlat)) *
sin(radians(`sending_to_latitude`))
)
) `todistance`
FROM `items` as Item
HAVING `senddistance` < $rad
AND `todistance` < $rad
AND from_date = $date
ORDER BY `senddistance`
anyway do the fact you are not using aggregation function and you don't have group bu then you don't should use having but only where
SELECT *, (
6371 *
acos(
cos( radians( $Flat ) ) *
cos( radians( `sending_from_latitude` ) ) *
cos(
radians( `sending_from_longitude` ) - radians( $Flon )
) +
sin(radians($Flat)) *
sin(radians(`sending_from_latitude`))
)
) `senddistance`, (
6371 *
acos(
cos( radians( $Tlat ) ) *
cos( radians( `sending_to_latitude` ) ) *
cos(
radians( `sending_to_longitude` ) - radians( $Tlon )
) +
sin(radians($Tlat)) *
sin(radians(`sending_to_latitude`))
)
) `todistance`
FROM `items` as Item
WHERE from_date = $date
AND `senddistance` < $rad
AND `todistance` < $rad
ORDER BY `senddistance`