[Calgon]

pawn Код:

new HighestNumber[ 12 ], HighestNumberInt;

mysql_query( "SELECT * FROM Users WHERE PhoneNumber = ( SELECT MAX( PhoneNumber ) FROM Users );" ); // Query for the result.

mysql_store_result(); // Store the result in memory
mysql_fetch_row_data(); // Fetch row data of the result
mysql_fetch_field( "PhoneNumber", HighestNumber ); // Fetch specific field
HighestNumberInt = strval( HighestNumber ); // This should be your highest number. 
mysql_free_result(); // Free the result to avoid using excessive memory

I know it's not optimal, but I rushed it and the query could probably be executed better. Some functions may be different, depending on which plugin you use. I use StrickenKid's and I've used it for this example.