Hi David,
David Scott wrote:
>
> I would like to add a column to a table where the column to be added is
> in another table. The column entries are to be matched using a
> particular column from each table.
>
> I have one table detailing phone calls, indexed by CallID. I have
> created another table with the same index and a column CallNumber which
> I want to add to the phone call table.
>
> I have looked at documentation and in the book I have available without
> success. Can anyone suggest appropriate syntax for this?
Two queries come to mind. The first is the "official" SQL searched-update syntax:
update PhoneCalls set CallNumber = (
select CallNumber from OtherTable
where PhoneCalls.CallID=OtherTable.CallID);
The second is a multi-table update, which every RDBMS does differently:
update PhoneCalls as p
inner join OtherTable as o using(CallID)
set p.CallNumber=o.CallNumber;
Cheers
Baron
