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Question
1.What is the difference between _NULL_ , _ALL_, and _N_?
2.What are the uses of _NULL_ using in Data Steps? Can we 
_NULL_ in Proc Steps also? 
3.How do call the macro variable in Data Steps?
4.How to construct Pivot tables in Excel Using SAS?
 Question Submitted By :: Suresh K
I also faced this Question!!     Rank Answer Posted By  
 
  Re: 1.What is the difference between _NULL_ , _ALL_, and _N_? 2.What are the uses of _NULL_ using in Data Steps? Can we _NULL_ in Proc Steps also? 3.How do call the macro variable in Data Steps? 4.How to construct Pivot tables in Excel Using SAS?
Answer
# 1
1. _NULL_ is not create Out put DataSet, it opens the file 
to write the dataset. _ALL_ for display contents in the 
library & used in cose the files in ODS and _N_ for search 
for Null characters.
 
Is This Answer Correct ?    0 Yes 1 No
Pnprasad
 

 
 
 
Other SAS Interview Questions
 
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What is the one statement to set the criteria of data that can be coded in any step?  2
How would you delete observations with duplicate keys?  5
Under what circumstances would you code a SELECT construct instead of IF statements? Accenture4
How to select the observations randomly from a SAS dataset  4
What other SAS features do you use for error trapping and data validation?  2
what are the validation tools in sas?  1
Name and describe three SAS functions that you have used, if any? Accenture3
What statement do you code to tell SAS that it is to write to an external file?  5
is there any differnce between proc means and proc summary?  2
Name statements that are recognized at compile time only? Accenture3
How do you generate random samples?  4
what is the diff. b/w proc means and proc summary? CitiGroup5
In the flow of DATA step processing, what is the first action in a typical DATA Step?  7
There is a field containing a date. It needs to be displayed in the format "ddmonyy" if it's before 1975, "dd mon ccyy" if it's after 1985, and as 'Disco Years' if it's between 1975 and 1985. How would you accomplish this in data step code? Using only PROC FORMAT D&B1
If you?re not wanting any SAS output from a data step, how would you code the data statement to prevent SAS from producing a set?  1
How do you add a number to a macro variable?  1
How could you generate test data with no input data?  9
hi guys ...i have one query... data abc; input s w k g o t a m; cards; 1 2 3 4 5 6 7 8 2 3 4 5 6 7 8 9 ; run; i want the output to be the sorted order(only variables).observations should not be changed..  5
how do u validate sas program Accenture1
What SAS statements would you code to read an external raw data file to a DATA step? Accenture5
 
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