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SQLServer2008 排序问题

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Release： 2016-06-07 15:33:29
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目前要对一张表进行 排序 ，CommentImages里面存的图片名字(如201312kdks.jpg),还有一个字段 CommentDate时间类型，现在要求 有图片的在上面，没有图片的(图片字段为空)的在下面， 有图片的按照CommentDate倒叙排列，没有图片的也按照倒叙排列。 我的方法是

目前要对一张表进行排序，CommentImages里面存的图片名字(如201312kdks.jpg),还有一个字段 CommentDate时间类型，现在要求  有图片的在上面，没有图片的(图片字段为空)的在下面，

有图片的按照CommentDate倒叙排列，没有图片的也按照倒叙排列。

我的方法是 order by Convert(bit,LEN(ISNULL(CommentImages,0))) desc,CommentDate desc)  但是这样 无法为CommentImages加上索引 所以很慢，即使分页了，只有10条数据，很慢

 

求大神降临

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