MySQL mengkonversi Derajat, Menit, Detik ke Derajat desimal

Lifehack yang bagus:solusi masalah terbalik (derajat ke DMS) menggunakan fungsi MySQL bawaan SEC_TO_TIME:

CREATE FUNCTION `geocoords`(lon double, lat double) RETURNS varchar(24) CHARSET cp1251
    NO SQL
    DETERMINISTIC
begin    
  declare alon double;
  declare alat double;
  declare slon varchar(12);
  declare slat varchar(12);
  set alon = abs(lon);
  set alat = abs(lat);
  set slon = TIME_FORMAT(SEC_TO_TIME(alon*3600), '%H°%i''%s"');
  set slat = TIME_FORMAT(SEC_TO_TIME(alat*3600), '%H°%i''%s"');
  if lon>0 then
    set slon = concat(slon, 'E');
  elseif lon<0 then  
    set slon = concat(slon, 'W');
  end if;  
  if lat>0 then
    set slat = concat(slat, 'N');
  elseif lat<0 then  
    set slat = concat(slat, 'S');
  end if;  
  return concat(slat, ' ', slon);
end