Re: Updating a table from another table

Try:

UPDATE customers
SET canceldate = cancels.canceldate
FROM cancels
WHERE customers.custnum = cancels.custnum;

You should also have an index on cancels(custnum).

JLL

Matthew Price wrote:
>
> Howdy All,
>
> I need to update many records in one table with data from another table that ultimately gets \copy-ed from an outside source.
>
> customers:
> custnum varchar(6),
> name text,
> canceldate date
> ...
>
> cancels:
> custnum varchar(6),
> canceldate date
>
> What is the right way to update the canceldate in the customers table from canceldate in the cancels table? Is there a way to use update to iterate rather than making a mass change?
>
> Thanks in advance,
> Matthew
>
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