ROUND(( 6371 * acos( cos( radians({$lat}) ) * cos( radians( case when tbl_clinic_doctors.clinic_id != '0' then `tbl_clinic`.`location_lattitude` else `tbl_doctors`.`default_latitude` end as location_lattitude) ) * cos( radians( case when tbl_clinic_doctors.clinic_id != '0' then `tbl_clinic`.`location_longitude` else `tbl_doctors`.`default_longitude` end as location_longitude) - radians({$lng}) ) + sin( radians({$lat}) ) * sin( radians( case when tbl_clinic_doctors.clinic_id != '0' then `tbl_clinic`.`location_lattitude` else `tbl_doctors`.`default_latitude` end as location_lattitude ) ) ) )) AS distance