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POget max value in php (instead of mysql)
 

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  1. POget max value in php (instead of mysql)
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    <p>I have two msyql tables, Badges and Events. I use a join to find all the events and return the badge info for that event (title &amp; description) using the following code:</p> <blockquote> <p>SELECT COUNT(Badges.badge_ID) AS badge_count,title,Badges.description FROM <code>Badges</code> JOIN <code>Events</code> ON Badges.badge_id=Events.badge_id GROUP BY title ASC</p> </blockquote> <p>In addition to the counts, I need to know the value of the event with the most entries. I thought I'd do this in php with the max() function, but I had trouble getting that to work correctly. So, I decided I could get the same result by modifying the above query by using "ORDER BY badgecount DESC LIMIT 1," which returns an array of a single element, whose value is the highest count total of all the events.</p> <p>While this solution works well for me, I'm curious if it is taking more resources to make 2 calls to the server (b/c I'm now using two queries) instead of working it out in php. If I did do it in php, how could I get the max value of a particular item in an associative array (it would be nice to be able to return the key and the value, if possible)?</p> <p>EDIT: OK, it's amazing what a few hours of rest will do for the mind. I opened up my code this morning, and made a simple modification to the code, which worked out for me. I simply created a variable on the count field and, if the new one was greater than the old one, changed it to the new value (see the "if" statement in the following code):</p> <blockquote> <p>if ( $c > $highestCount ) { $highestCount = $c; }</p> </blockquote>
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    1. COIf you're worried about the (read) performance have you considered to calculate and store the redundant information when a new entry is made?
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    2. COCheck out this very similar question asked less than 15 minutes ago: http://stackoverflow.com/questions/1345307/php-retrieve-minimum-and-maximum-values-in-a-2d-associative-array
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