小编and*_*ndy的帖子

我一直在尝试使用该IsNull()函数来确保字段的值.

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

但我收到错误消息:

调用本机函数'IsNull'时参数计数不正确

有人有什么想法吗？我是MySQL的新手.