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SUM() Math in mySQL

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I am working on the query below.  Itâs purpose is to manage the RSS Feed for the site.

The part of the query I am struggling with is:

SUM(`include_in_rss_feed`) AS current_rss_feed

What I need is the total value of *ALL* the `include_in_rss_feed` , not the specific row.

`include_in_rss_feed` is an integer.  It only ever has a value of 1

My thinking is if the total value of  `include_in_rss_feed` and if it is less than 15 the RSS Feed needs to be regenerated because of recent updates to the site.

Thanks in advance for helping me.  This is for a clients site, not mine.  I really appreciate it.

Ron


SELECT new_rss_feed_listings.reference, new_rss_feed_listings.last_update, SUM(`include_in_rss_feed`) AS current_rss_feed, `ministry_profiles`.`organization`, `ministry_profiles`.`city`, `ministry_profiles`.`province_state`, `ministry_profiles`.`postal_zip_code`, `ministry_profiles`.`country`
FROM (
(

SELECT `reference` , `last_update`
FROM `ministry_profiles`
WHERE `live` =1
ORDER BY `last_update` DESC
LIMIT 15
)
UNION ALL (

SELECT `ministry_profiles_reference` , `last_update`
FROM `ministry_profiles_activity`
WHERE `live` =1
GROUP BY `ministry_profiles_reference`
ORDER BY `last_update` DESC
LIMIT 15
)
UNION ALL (

SELECT `ministry_profile_reference` , `last_update`
FROM `ministry_profiles_listing_details`
WHERE `live` =1
GROUP BY `ministry_profile_reference`
ORDER BY `last_update` DESC
LIMIT 15
)
UNION ALL (

SELECT `ministry_profiles_reference` , `last_update`
FROM `ministry_profile_categories`
WHERE `live` =1
GROUP BY `ministry_profiles_reference`
ORDER BY `last_update` DESC
LIMIT 15
)
) AS new_rss_feed_listings 
LEFT OUTER JOIN `rss_feed_listings` ON new_rss_feed_listings.reference = `rss_feed_listings`.`ministry_profiles_reference` 
INNER JOIN `ministry_profiles` ON `ministry_profiles`.`reference` = new_rss_feed_listings.reference 
ORDER BY new_rss_feed_listings.last_update DESC LIMIT 15

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