Question

Is it possible to populate a field in function of data stored in another field? I explain me better: in a database there is a field “telnum” (telephone number) where are stored telepnone numbers with international prefix. Can i populate the “country” field in function of the prefix of each number using a php command?

This is the database:

  ______________________________________________
  |  id  |   telnum   |   name   |   country   |
  ----------------------------------------------
  |  01  | 003912377  |   Smith  |             |
  |  02  | 004412345  |   White  |             |
  |  03  | 005454321  |   Lopez  |             |

The “php command” should associate to each different prefix the country name in my sql table. In the example we have 0039 -> Italy, 0044 -> UK, 0054 -> Argentina… and so on.
Result must be this:

  ______________________________________________
  |  id  |   telnum   |   name   |   country   |
  ----------------------------------------------
  |  01  | 003912377  |   Smith  |   Italy     |
  |  02  | 004412345  |   White  |    UK       |
  |  03  | 005454321  |   Lopez  |  Argentina  |

Thanks in advance to everybody for your help.
Greetings, Mattew

Answer 1

You can use case statement within a query

update table
set country =
case 
when left(telnum,4) = 0039 then 'Italy'
when left(telnum,4) = 0044 then 'UK'
when left(telnum,4) = 0054 then 'Argentina'
else ''
end