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What is _n_?
 Question Submitted By :: SAS
I also faced this Question!!     Answer Posted By  
# 1
it gives the Number of iterations. 
Is This Answer Correct ?    78 Yes 15 No
# 2
_N_ gives the record number. You can access any record in
the dataset using _N_ if you know the record number. It is
set as 1 for the first record and incremented for every
subsequent record. It is an automatic variable and is not
visible when you open a dataset. This can also be used to
subset a data. For ex, if you want to access the first 100
records then you can say "if _N_ <= 100".
Is This Answer Correct ?    52 Yes 1 No
Chandra Sekar
# 3
suresh is write.
_n_ : gives the number of times SAS system looped through a
data step

Sudheer's answer is for _error_ :
_error_ : gives value of 0 or 1 depending on it is error or
not..if it is an error _error_ value will be 1 else 0
Is This Answer Correct ?    31 Yes 10 No
# 4
This is an automatic variable of PDV that returns the no of
observations that it has iterated.There are such variables
like _Error_,end=,in=,,,..etc
All these variables will not be displayed in the target output.
Data new;
set <existed>;
if _n_>=2 and <=6 then output;
Is This Answer Correct ?    4 Yes 1 No
Mallikarjuna Raju
# 5
_n_ is auto number drive in SAS...

if use fro data step look like this

data test1;
set test;

diferent if auto number for SQL procedure u can use this

proc sql;
create table test1 as
select *,monotonic() as test_field
from test;

Is This Answer Correct ?    2 Yes 0 No
Yadi Acho
# 6
Can i used _n_ in proc sql; Or its only for Datasteo

_n_ is a Autometic variable created in a datastep. It is a
part of PDV. It is used to store the iteration count of the
Input statement.

Proc SQL doesnot create a PDV. so _n_ variable cannot be
used there.
Is This Answer Correct ?    2 Yes 1 No
# 7
It acts like a pointer and can be used to subset your data
set _n_=10 in data step will force SAS to process the data
until first 10 observations
Is This Answer Correct ?    0 Yes 0 No
# 8
Compiling time of the program in PDV automatically some
variables will generate, like _N_ and _Error_, _numeric_
_N_ will give the observation in the program. by default
_N_ value is 0, after compiling it will chage according to
the observations in the program.
Is This Answer Correct ?    2 Yes 3 No
# 9
Can i used _n_ in proc sql; Or its only for Datasteo 
Is This Answer Correct ?    0 Yes 1 No
# 10
It is an automaic variable created during datastep
processing. And it show how many no of time it has iterated
Is This Answer Correct ?    1 Yes 3 No

Other SAS Interview Questions
  Question Asked @ Answers
For what purpose(s) would use the RETURN statement?   1
differnce between 8.2 and 9.1.3   1
how to delete the duplicates by using proc sql? Genpact 2
how to assign a macro value to a variable? CitiGroup 8
what are input dataset and output dataset options? HCL 6
%STPbegin;%STPEND; ERROR: No logical assign for filename _WEBOUT. WARNING: No body file. HTML output will not be created. unable to fix it.plz help   2
How would you code a merge that will keep only the observations that have matches from both sets?   5
Difference b/n proc means and proc summary procedures? accenture 3
How do you download a flat file from Mainframe to your local PC using SAS?   3
What do you feel about hardcoding?   1
If i doest required Cumilative frequency in my table, generated by using PROC FREQ what i had to do? HCL 8
Suppose there is a SAS dataset with following values - Parent Child A B B C D E F G G H H I and so on….. This goes onto 1000s of observations/rows. Now how do we identify from this dataset Grandparents and Grandchildrens ? Barclays 4
For more SAS Interview Questions Click Here 

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