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标题: 跟crakman做sas base认证试题（49） [打印本页]

作者: shiyiming 时间: 2010-11-13 00:31
标题: 跟crakman做sas base认证试题（49）
From crackman's blog on Baidu

49.The following SAS program is submitted: 
 
 data WORK.TOTALSALES(keep=MonthSales{12}); 
     set WORK.MONTHLYSALES(keep=Year Product Sales); 
     array MonthSales{12}; 
     do i=1 to 12; 
        MonthSales{i}=Sales; 
     end; 
     drop i; 
 run; 
 
The program fails execution due to syntax errors. 
What is the cause of the syntax error? 
     A. An array cannot be referenced on a keep= data set option. 
     B. The keep= data set option should be (keep=MonthSales*). 
     C. The keep= data set option should be the statement KEEP MonthSales{12}. 
     D. The variable MonthSales does not exist. 
 
Answer:A
本题考察的是数组以及KEEP语句。 
KEEP语句中必须是具体变量，不能是数组。 
另外数组MonthSales{12}，并没有说明这个数组内部的成员名称。通过下标来引用数组成员的。 <a href="http://hi.baidu.com/crack%5Fman/blog/item/cb239827dbe6f854ac34de20.html">阅读全文</a>

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