Re: UPDATE using subquery with joined tables

Seems like this should work (untested though):

UPDATE table1 a
SET field1 = a.field1 || (SELECT regexp_replace(b.field1, '....', '...')
FROM table2 b WHERE a.id = b.id AND b.field1 LIKE '....')
WHERE a.field1 NOT LIKE '....'

Paul

On Tue, Dec 4, 2012 at 11:52 AM, Sebastian P. Luque <spluque(at)gmail(dot)com>wrote:

> Hi,
>
> I need to update field1 in table1, gathering data from field1 in table2.
> The following SELECT shows the data as it needs to be updated:
>
> SELECT a.field1 || regexp_replace(b.field1, '.*(mypattern)', e'. \\1')
> FROM table1 a JOIN table2 b USING (id)
> WHERE a.field1 NOT LIKE '%mypattern%' AND b.field1 LIKE '%mypattern%';
>
> I am not sure how to translate this into an UPDATE statement for fiel1
> in table1 efficiently. Any tips welcome.
>
> Cheers,
>
> --
> Seb
>
>
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