topic Re: join many tables with SQL full outer join in SAS Programming

join many tables with SQL full outer join

Alankar — Wed, 23 Mar 2016 05:09:03 GMT

DATA REVENUE;
MERGE REV_1004 (KEEP = ID REVENUE RENAME =(REVENUE = REV1004)
	REV_1005 (KEEP = ID REVENUE RENAME =(REVENUE = REV1005)
	REV_1006 (KEEP = ID REVENUE RENAME =(REVENUE = REV1006)
	REV_1007 (KEEP = ID REVENUE RENAME =(REVENUE = REV1007)
	REV_1008 (KEEP = ID REVENUE RENAME =(REVENUE = REV1008)
	REV_1009 (KEEP = ID REVENUE RENAME =(REVENUE = REV1009)
	REV_1010 (KEEP = ID REVENUE RENAME =(REVENUE = REV1010)
	REV_1011 (KEEP = ID REVENUE RENAME =(REVENUE = REV1011)
	REV_1012 (KEEP = ID REVENUE RENAME =(REVENUE = REV1012)
	REV_1101 (KEEP = ID REVENUE RENAME =(REVENUE = REV1101)
	REV_1102 (KEEP = ID REVENUE RENAME =(REVENUE = REV1102)
	REV_1103 (KEEP = ID REVENUE RENAME =(REVENUE = REV1103);
BY ID;
RUN;

I would like to write the same code in SQL and output supposed to be same, any help?

Re: join many tables with SQL full outer join

LinusH — Wed, 23 Mar 2016 06:04:36 GMT

Just use the FILM JOIN - ON construct.
Why do you want to use SQL I'd you already have a working piece of code?

Without knowing anything about the data, but shouldn't a union be more appropriate? Looks like you are denormalizing.

Re: join many tables with SQL full outer join

Reeza — Wed, 23 Mar 2016 07:39:35 GMT

I would echo suggestion from above, union or stack datasets and then transpose from wide to long.

Re: join many tables with SQL full outer join

Kurt_Bremser — Wed, 23 Mar 2016 08:12:29 GMT

The only thing that I would do with this code is that I would automate it so I only need to set begin and end months, and the code is built dynamically.

%let begin='01apr2010'd;
%let end='01mar2011'd;

data _null_;
length command $100;
date = &begin;
call execute('data revenue; merge ');
do while (date <= &end);
  yymm = substr(put(year(date),z4.),3,2)!!put(month(date),z2.);
  command = 'rev_'!!yymm!!' (keep=id revenue rename=(revenue = rev'!!yymm!!')';
  call execute(command);
  date = intnx('month',date,1,'begin');
end;
call execute('; by id; run;');
run;

Re: join many tables with SQL full outer join

Oligolas — Wed, 23 Mar 2016 13:26:01 GMT

In this particular case one could also shorten the code to:

DATA _NULL_;
   SET sashelp.vtable end=last;
   where libname eq 'WORK' and substr(memname,1,4) eq 'REV_';
   if _N_ eq 1 then call execute('DATA REVENUE; MERGE ');
   call execute(strip(memname)||' (KEEP = ID REVENUE RENAME =(REVENUE = '||strip(compress(memname,"_"))||'))');
   if last then call execute(';BY ID; RUN;');
RUN;

Re: join many tables with SQL full outer join

Alankar — Fri, 25 Mar 2016 02:27:35 GMT

I am exploring SQL options, thus trying to convert SAS data steps and procedures in to PROC SQL.

by the way do we have FILM JOIN? never heard of it. how to use?