目录1.LAG()函数Demo：Demo：基础用法Demo：带偏移量的LAG()函数Demo：带默认值的LAG()函数Demo：LAG()函数，比较每一天的销售额与前一天的销售额的差异。2.LEAD()函数Demo：基础用法Demo：带偏移量的LEAD()函数Demo
I have a link to a Facebook page from a website. I know I can use the URL scheme 开发者_高级运维href=\"fb://\" to open up the Facebook application from within an iPhone, but if the iPhone user does no
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