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summing by group using SQL

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Occasional Contributor
Posts: 16

summing by group using SQL

If I have a dataset like this

 

MetricProdR_1R_2R_3R_4
NA1245
RA23345
NB21333
RB1234

 

I want to group by Metric and Prod.

Proc sql;
create table want as
select metric, prod, sum(r_1) as r_1, sum(r_2) as r_2, sum(r_3) as r_3, sum(r_4) as r_4
from have 
group by metric, prod;
quit;

 

Here since it has only 4 variables to sum so I can write from R_1 to R_4. What if I had 100 variables to sum? What is the efficient way of doing this?

 

Thanks

Chandan Mishra 

Super User
Posts: 7,791

Re: summing by group using SQL

Posted in reply to chandan_mishra

You can use a wildcard variable name in proc summary:

proc summary data=have sum;
by metric prod;
var r_:;
run;

If you absolutely want to do it in SQL, you can use a macro loop to generate the summations.

---------------------------------------------------------------------------------------------
Maxims of Maximally Efficient SAS Programmers
Respected Advisor
Posts: 4,925

Re: summing by group using SQL

Posted in reply to chandan_mishra

SAS/SQL doesn't support variable lists the way the data step and SAS procs do. One alternative is to do the SQL summations on a transposed version of your dataset.

PG
PROC Star
Posts: 102

Re: summing by group using SQL

Posted in reply to chandan_mishra

The pure SQL way is to use dictionary.tables:

proc sql noprint; /* noprint because we do not want to see the SELECT INTO results as a table */
select catx(' ','sum(',name,') as', name) into :sums separated by ','
  from dictionary columns
  where libname='WORK' 
    and memname='HAVE'
    and upcase(name) like 'R%'
   ;
create table want as select
  metric,
  prod,
  &sums
from have
group by metric,prod
;
quit;
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