[wp-hackers] Extending the user search

[scribu]

Ah, I ran into the same problem for postmeta values. This is the what I came
up with:

WHERE CASE meta_key
WHEN 'key1' then meta_value = 'value1'
WHEN 'key2' then meta_value = 'value2'
END
GROUP BY ID
HAVING COUNT(ID) = 2

On Thu, Mar 12, 2009 at 9:52 AM, John Blackbourn
<johnbillion+wp at gmail.com<johnbillion%2Bwp at gmail.com>
> wrote:

> I guess this is really an SQL question but I thought I'd ask here.
>
> I'm writing a plugin which extends the user search/filter
> functionality on the Users admin screen. It allows a user to filter
> the results based on two custom user meta values. The [simplified] SQL
> which retrieves the users is:
>
> SELECT * FROM wp_users, wp_usermeta WHERE wp_usermeta.meta_key =
> 'key1' AND wp_usermeta.meta_value = 'value1'
>
> That's all well and good for one meta value, but I am absolutely
> stumped about how I can test for a second meta key/value pair which
> must also be present. The problem is that the second meta_key will
> have a different value to the first, and adding something like:
>
> AND wp_usermeta.meta_key = 'key2' AND wp_usermeta.meta_value = 'value2'
>
> will always return zero rows because you're trying to retrieve a row
> with two different values for the same field (meta_key = 'key1' AND
> meta_key = 'key2').
>
> Any SQL experts out there that could give me a pointer?
>
> John
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