使用DESC的SQL查询无法正常工作

Question

我不会理解为什么排序不能正常使用"ORDER BY average,votes DESC",因为我需要最高的平均值并且投票从上到下,但是DESC没有解决什么问题.我在var_dump http://pastie.org/private/b05smuh0fvw72wwp2w1zq最高entrie的结果在底部,但我需要从顶部开始并且到底部.

SELECT c.*, r.votes, c.total_comments,
       ROUND(sumrate / votes) AS average
FROM catalog c LEFT JOIN
     (SELECT r.object_id, COUNT(*) as votes, SUM(r.rate) as sumrate
      FROM ratings r
      GROUP BY r.object_id
     ) r
     ON r.object_id = c.catalog_id LEFT JOIN
     (SELECT c.catalog_id, COUNT(*) as total_comments
      FROM comments c
      GROUP BY c.catalog_id
     ) c
     ON c.catalog_id = c.catalog_id
GROUP BY c.catalog_id
ORDER BY average, votes DESC;

Answer 1

因为您可以定义每列的顺序而不仅仅是order by总计.默认是ASC.

你的订单

ORDER BY average, votes DESC

自动转入

ORDER BY average ASC, votes DESC

但是你在寻找

ORDER BY average DESC, votes DESC