Base SAS/SQL Tricky QuestionsLeave a Comment

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Question: Dataset calc is given as :

data calc;

input id marks;

cards;

1 97

2 95

3 45

4 54

5 45

6 48

7 47

8 47

9 45

10 58

;

run;

Find the sum of all marks from id 3 to id 8

1. Using Data Step

2. Using Proc SQL

3. Using proc means

4. Using Proc report

Answer:

Using data Step

data tot;

set calc;

if 3<=id<=8 then

total+marks;

if id=8 then put total=;

run;

Another method using data step:

data tot;

set calc(firstobs=3 obs=8);

total+marks;

run;

Using Proc SQL:

proc sql;

select sum(marks) from mydata where id ge 3 and id le 8;

run;

Using Proc means

option firstobs=3 obs=8;

proc means data = calc sum;

var number;

run;

Using Proc Report

option firstobs=3 obs=8;

proc report data = calc nowd;

column marks;

run;

Question:

Data set secondhig is given as

data secondhig;

input Name $ Number;

cards;

sandeep 98

kuldeep 49

arvind 58

gajender 97

amit 69

ankit 97

abhishek 70

;

run;

Select those name having second highest numbers such that the output should be like:

Name Number

gajender 97

ankit 97

Answer:

proc sql;

select name, number from secondhig where number in (select max(Number) as second from secondhig where number<(select max(Number)from

secondhig));

quit;

Question

data countobser;

input name $ grade $;

cards;

Ram A

Raj B

Rahim A

Manu C

Karan C

Praveen A

Pradeep A

Ravi B

;

run;

Create a data set that contains number of times A grade is repeated, B Grade is repeated and so on..

Answer:

proc freq data = countobser noprint;

tables grade/out=counter(drop=percent);

run;

Question

In the above data set, create a macro varible that counts the number of observations in the dataset

Using Data Step

Using SQL Query

Also print the result in SAS log

Answer:

data _null_;

set countobser end=eof;

count+1;

if eof then call symput(‘macvar’, count);

run;

%put &macvar;

proc sql;

select count(*) into :macvar1 from countobser;

quit;

Question:

Find the mode using proc freq

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;

Answer:

proc freq data = a noprint;

tables age/out=datam(drop=percent);

run;

from the dataset datam, it can be seen that 32 is repeated maximum number of times(3), thus the mode age is 32.

Question: Dataset schoolx is given as :

data schoolx;

input Name $ Class $ Marks;

cards;

AAA X 20

AAA Y 30

AAA Z 40

AAA X 50

BBB X 60

BBB Y 70

BBB X 20

CCC X 10

CCC Y 40

CCC Z 50

CCC Z 30

;

run;

Generate the following output from the above dataset:

AAA X 70

AAA Y 30

AAA Z 40

BBB X 80

BBB Y 70

CCC X 10

CCC Y 40

CCC Z 80

Answer:

proc sort data = schoolx;

by Name class;

run;

data schoolx(drop=marks);

set mydat;

by name class;

if first.class then sum = 0;

sum+marks;

if last.class then output;

run;

Question:

Dataset sales is given as:

store dept quarter sales

101 10 1 110001.5

101 10 2 113101.2

101 10 3 111932.15

101 10 4 99901.1

101 20 1 110002.36

101 20 2 99922.39

101 20 3 98832.98

101 20 4 110101.7

121 20 1 121947.1

121 20 2 119964.69

121 20 3 122136.28

121 20 4 120111.11

121 10 1 127192.92

121 10 2 125280.13

121 10 3 128203.56

121 10 4 123632.29

109 10 1 120422.77

109 10 2 123984.32

109 10 3 121801.29

109 10 4 122125.66

109 30 1 98310.13

109 30 2 97331.25

109 30 3 96386.28

109 30 4 98511.9

109 20 1 115239.09

109 20 2 113001.98

109 20 3 114234.32

109 20 4 114122.65

Create a dataset having sum of sales by different stores.Also format the sales from different depts.

Answer

proc sort data = mydat;

by store;

run;

data sumsales;

set mydat;

by store;

if first.stote then sum=0;

sum+sales;

if last.store;

drop dept quarter sales;

format sum dollar13.2;

run;

Question:

Dataset student1 is given as:

DATA student1;

INPUT id $ quiz score;

CARDS;

001 1 6

002 1 5

003 1 7

003 2 4

005 1 8

004 1 .

004 2 .

001 2 8

001 3 6

005 2 .

002 2 9

003 3 3

005 3 7

002 3 6

004 3 .

;run;

Using the concept of first.var and last.var, find the quiz(out of the three) for which score of a particular student is maximum.

The final dataset should be like:

id score

001 8

002 9

003 7

and so on..

Answer:

PROC SORT DATA=student1;

BY id quiz;

RUN;

DATA student2;

SET student1;

BY id;

RETAIN highest;

IF FIRST.id THEN highest=.;

highest = MAX(highest, score);

drop quiz score;

if last.id;

RUN;

Question:

data work.test;

First = ‘lpswich, England’; /* length of var first is 16 */

City = substr(First,1,7);

run;

What is the length of variable City in output dataset?

A. 7

B. 8

C. 16

D. Missing Value

Answer: : C. 16

Question: I have a dataset misval. I want to replace all the missing values with the mean value of that variable.

data misval ;

input var1-var5;

datalines;

1 . 1 6 6

2 5 2 7 7

3 5 . 8 8

4 5 4 9 9

5 5 5 . 10

;

Answer: Use proc standard + replace option

proc standard data = misval out = misval2 replace;

run;

Question:

I want to count how many times day is repeated in the string “good good study, day day up”

Answer:

data a;

x=”good good study, day day up”;

y=count(x,’day’);

run;

Question: 

How to put leading zeros in front of numbers having len less then 9?

data mydat;

input prsnno;

cards;

1234

12345

123456

1234567

12345678

123456789

;

run;

Answer:

data mydat1;

set mydat;

length psn_char $9.;

psn_char = put(prsnno,z9.);

run;

Question:

How to put leading zeros in front of prsnno(char var) having len less then 9?

data mydat;

length prsnno $9;

input prsnno $ ;

cards;

1234

12345

123456

1234567

12345678

123456789

;

run;

Answer:

data mydat2;

set mydat;

format y z9.;

y=prsnno*1;

run;