有没有返回当前变量下一行值的函数?
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descending也行,不过有没有直接取下一行的?好像oracle中就有这类的函数,可以直接取下一行的值
If you have access to SAS/ETS, PROC EXPAND has a "lead[n]" transformation operation. Otherwise, you gotta do it manually.
See this page for more tips. http://www.sconsig.com/sastips/tip00070.htm
I usually use the last solution by Ian Whitlock.
YueweiLiu 发表于 2012-7-13 23:10 I/O functions