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标题: 跟crakman做sas base认证试题（61） [打印本页]

作者: shiyiming 时间: 2010-11-13 16:40
标题: 跟crakman做sas base认证试题（61）
From crackman's blog on Baidu

61.Consider the data step: 
 
data WORK.TEST; 
   infile 'c:\class1.csv' dsd; 
   input Name $ Sex $ Age Height Weight; 
   if Age NE 16 and Age NE 15 then Group=1; 
   else Group=2; 
run; 
 
Which statement produces a functionally equivalent result for assigning Group a value?
     A. if Age not in(15,16) then Group=1; else Group=2; 
     B. if (Age NE 16) or (Age NE 15) then Group=1; else Group=2; 
     C. where Age not between 15 and 16 then Group=1; else Group=2; 
     D. both A or C will work.
Answer: A
 
本题考察IF ELSE语句以及筛选条件。 
C是错误，WHERE不能这样与THEN连用，THEN只能与IF 配对使用。 <a href="http://hi.baidu.com/crack%5Fman/blog/item/96fbd0fdfd923f49242df2a5.html">阅读全文</a>

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