# 4 ways to find maximum value in a group with SAS

Suppose you have sales data. You wish to find maximum sales generated by a product ID.

data test;
input ID product \$  Sale;
cards;
1 A 4.5
1 B 1
1 C 4.25
1 D 3
1 E  4.75
2 F 4.9
2 G  4.1
2 H 3
2 I 4
2 J  4.05
;
run;

Method I .
proc sort data = test;
by ID descending sale;
run;

proc sort data = test nodupkey;
by ID;
run;

Method II.

proc sort data = test;
by ID descending sale;
run;

data test1;
set test;
by ID;
If first.ID then output test1;
run;

Method III.
proc sort data = test;
by ID;
run;

proc rank data=test out= test2(where=(sale_rank=1))  ties=low descending;
by ID;
var sale;
ranks sale_rank;
run;

Method IV.
proc sql noprint;
create table t1 as
select * from test a inner join
(select ID, max(sale) as maxsale
from test
group by ID) b
on a.ID = b.ID and a.sale = b.maxsale;
quit;
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Deepanshu founded ListenData with a simple objective - Make analytics easy to understand and follow. He has over 10 years of experience in data science. During his tenure, he worked with global clients in various domains like Banking, Insurance, Private Equity, Telecom and HR.

Post Comment 5 Responses to "4 ways to find maximum value in a group with SAS"
1. In the last method by using proc sql,want to know which is the table b on which we are applying an inner join

1. It's the same table 'test'. We are applying self join here i.e. a table is joined to itself.

2. Why are we applying self join here when a simple query can give the same results?

proc sql;
select id, product, max(sale) as max_sale from test
group by ID;
quit;

2. How to find out second maximum using proc sort only... Plz tell..Thank u..

1. proc sort data= test;
by id descending sale;
run;

data test1;
set test;
by id;
if first.id=1 then count=1;
else count+1;
if count=2 then output test1;
run;

I hope this will work.

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