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Re: can I update a field (atomically) using a join?

Posted by Toby A Inkster on 07/22/07 01:47

newbie wrote:

> Can I join the two table an update the field 'scanned' on the rows
> being selected?

Yep.

UPDATE table1
INNER JOIN table2 ON table1.id=table2.id
SET table1.scanned=1
WHERE table2.owned_by='sam';

UPDATE table1
INNER JOIN table2 ON table1.id=table2.id
SET table1.scanned=CASE WHEN table2.notes='boring' THEN 0 ELSE 1 END
WHERE table2.owned_by='sam';

--
Toby A Inkster BSc (Hons) ARCS
[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
[OS: Linux 2.6.12-12mdksmp, up 31 days, 5:19.]

Parsing an HTML Table with PEAR's XML_HTTPSax3
http://tobyinkster.co.uk/blog/2007/07/20/html-table-parsing/

 

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