Gary,
> This means that e.g. all mobile numbers that used to start 0589 now
> start 07889.
>
> Is there a way in SQL to update the phone number in-place?
Postgresql has a nifty string substitution function. For this and other
character manipulation functions, see:
http://www.postgresql.org/idocs/index.php?functions-string.html
You should be able to fairly easily swap out "07889" and replace it with
"0589".
-Josh
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