:: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Categories >> Software >> Data Warehouse >> SAS


 Teradata interview questions  Teradata Interview Questions (183)
 Business Objects interview questions  Business Objects Interview Questions (756)
 Cognos interview questions  Cognos Interview Questions (851)
 Informatica interview questions  Informatica Interview Questions (1624)
 Crystal Enterprise Suite interview questions  Crystal Enterprise Suite Interview Questions (29)
 Actuate interview questions  Actuate Interview Questions (35)
 Ab Initio interview questions  Ab Initio Interview Questions (172)
 Data Stage interview questions  Data Stage Interview Questions (564)
 SAS interview questions  SAS Interview Questions (556)
 Micro Strategy interview questions  Micro Strategy Interview Questions (36)
 ETL interview questions  ETL Interview Questions (195)
 Data Warehouse General interview questions  Data Warehouse General Interview Questions (216)
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
what is pdv? how it is related to input buffer in sas? Satyam 5
How to do user inputs and command line arguments in SAS? D&B BoA 1
what is the difference between compiler and interpreter? give any one example (software product) that act as a interpreter? Accenture 36
what is validvarname and varnum? why we are using this options; explain with a syntax for this options? Max-India 1
Does anybody has lastest SAS certification dumps,if anybody has please mail me on   1
You have a data set of 100 observations,how can you restrict the output so that the output has only data from row no. 10 to row no. 20   8
What is _n_?   21
Can you calculate the mean, median and mode of the following data set using data step logic? Don't use any function or procedure. data a; input age @@; datalines; 22 32 32 32 43 23 24 56 45 54 28 29 27 26 25 28 30 20 18 37 36 47 46 56 19 20 ; run; I have calculated the mean which i have posted in the answer section. HSBC 6
Approximately what date is represented by SAS date value of 730   9
How can you put a "trace" in your program?   2
How to find out no. of business days in a month using macros.???(excluding weekends and holidays). HSBC 1
For more SAS Interview Questions Click Here 

Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
Copyright 2013  All Rights Reserved.   ::