mysql join default value

Posted by andy on Stack Overflow See other posts from Stack Overflow or by andy
Published on 2010-05-06T23:23:20Z Indexed on 2010/05/06 23:28 UTC
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join

I've been trying to use the IsNull() function to ensure that there is a value for a field.

    $result = mysql_query("
SELECT crawled.id,IsNull(sranking.score,0) as Score,crawled.url,crawled.title,crawled.blurb
FROM crawled
LEFT JOIN sranking ON crawled.id = sranking.sid
WHERE crawled.body LIKE '%".$term."%'
ORDER BY Score DESC LIMIT " . $start . "," . $c . " ") or die(mysql_error());

But I get the error message:Incorrect parameter count in the call to native function 'IsNull'

Anybody have any ideas? I'm pretty new to mySQL.

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