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Counting the Values by Using Case When

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Super Contributor
Posts: 395

Counting the Values by Using Case When

Hello everyone,

 

I would like to ask a question to you. It is related to Proc Sql statement and Case When. I want to count the number "1" values in the"Numeric" variable also by grouping "Numeric". However, in the following example, the query brings two rows but actually, I expect just one row. Can somebody help me by checking the following sample, please?

 

Data Have;
Length Character $ 8 Numeric 8;
Infile Datalines Missover;
Input Character	Numeric;
Datalines;
33 1
33 2
33 3
33 3
33 1
33 2
33 2
33 3
33 3
;
Run;

PROC SQL;
Create Table Want As
Select Distinct Character
,Case
When Numeric=1 Then Count(Numeric)
End As CountNumeric
From Have
Where Character='33'
Group By Numeric;
QUIT;

My desired output;

Desired.png

 

Thank you

Super Contributor
Posts: 266

Re: Counting the Values by Using Case When

--One way

PROC SQL;
Create Table Want As
Select Character
,count( numeric) as count_numeric
From Have
Where Character='33' and numeric =1
Group By character;
QUIT;


--Alternate way
PROC SQL;
Create Table Want2 As
Select Character
,sum( case when  numeric=1 then 1 end ) as count_numeric
From Have
Where Character='33' 
Group By character;
QUIT;



Super Contributor
Posts: 395

Re: Counting the Values by Using Case When

Thanks a lot, can you also give brief information about the reason? Why it was bring mising values in my query?

Super Contributor
Posts: 266

Re: Counting the Values by Using Case When

There are couple of problem in the query

1. Use of aggregate function and use of distinct at the same time do not make any sense. Because aggregate function itself result one row per group.

 

2. The query need to group by  using Character column but it has used group by Numeric. The Group by should used on grouping variable which is Character in this case.

 

3. Count function used in case when then statement do not make any sense. 

 

 

Super User
Posts: 10,035

Re: Counting the Values by Using Case When

use HAVING clause:

Data Have;
Length Character $ 8 Numeric 8;
Infile Datalines Missover;
Input Character	Numeric;
Datalines;
33 1
33 2
33 3
33 3
33 1
33 2
33 2
33 3
33 3
;
Run;

PROC SQL;
Select Character,Numeric,count(*) As CountNumeric
From Have
Group By Character,Numeric
having Character='33' and Numeric=1;
QUIT;


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