sqlmysql

Unknown column for calculate field in MySQL

I am having this problem in a complex query. This is the simplificated version:

SELECT sin(3.14) as s from my_table where s < 1

Error: #1054 - Unknown column 's' in 'where clause'

Solution

  • HAVING will SAVE You

    SELECT *,(((acos(sin((".$lat."*pi()/180)) *sin((latitud*pi()/180))
+cos((".$lat."*pi()/180)) 
* cos((latitud*pi()/180)) 
* cos(((".$lng."- longitud)*pi()/180))))*180/pi())
*60*1.1515*1.609344) as distance 
FROM pois_data,pois_cat 
WHERE pois_data.idtipo=pois_cat.id AND latitud IS NOT NULL 

HAVING distance <1