=CONCATENATE(B2,".",C2,".",D2)

--Update Script
  =CONCATENATE("UPDATE Location SET Location_Description = '", D2, "'  WHERE  LOCATION_CODE ='", B2,"' AND LOCATION_NAME ='", C2, "'")

 UPDATE Location 
   SET Location_Description = 'Thats where I Live'
 WHERE LOCATION_CODE = '600018'
   AND LOCATION_NAME = 'Teynampet'