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标题: 跟crakman做sas base认证试题（22） [打印本页]

作者: shiyiming 时间: 2010-11-11 13:12
标题: 跟crakman做sas base认证试题（22）
From crackman's blog on Baidu

22.Which step displays a listing of all the data sets in the WORK library? 
     A. proc contents lib=WORK run; 
     B. proc contents lib=WORK.all;run; 
     C. proc contents data=WORK._all_; run; 
     D. proc contents data=WORK _ALL_; run; 
Answer: C 
考察的是proc contents过程语句格式。 
Proc contents lists the structure of the specified SAS data set. The information includes the names and types (numeric or character) of the variables in the data set. The most common form of usage is 
proc contents data=second; 
run;
This lists the information for the data set second. The invocation 
proc contents data=_all_; 
run;
lists the contents of all data sets in the current catalog. 
For further information see the online help under SAS SYSTEM HELP--DATA MANAGEMENT--CONTENTS or the SAS Procedures Guide. 
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