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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
Can you continue to write code while the rest of the people on the floor where you work have a noisy party to which you were not invited? Oracle 2
data jagan1.s; input bp$; cards; 100/90 120/89 112/87 run; in the above code how to convert character data values to numeric data values?   2
how to import HTML files into SAS datasets? HP 2
how to generate report for 0 observation dataset? Mind-Tree 1
How would you determine how far down on a page you have printed in order to print out footnotes?   3
What happens in the following code, if u type 8 instead of *? proc sql noprint; create table abc as select 8 from; quit;   3
what is the use of LRECL option. L&T 1
i have a data set with 20 observations i want label from 8 to 15 observations ? how you create this one. CTS 6
what is AE onset date and what is RDS? Accenture 4
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? Accenture 8
What are the joins,types of joins and thier functions? SAS 7
Name statements that are recognized at compile time only?   4
For more SAS Interview Questions Click Here 

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