dynamic date range of one year in Proc SQL pass through query

Question

New to SAS and SQL and struggling to create a dynamic range in PROC SQL.

As of now, code is hard coded as -

xxxx.xx_ccyymm_xx between '201607' and '201706'. Trying to create a dynamic range so that next month when it is run, it takes on values as 201608 and 201707.

*the variable stores date as in string format

Someone please suggest a way out!!

Sincere Thanks in advance.

Answer 1

In proc sql :

. . .
where xxxx.xx_ccyymm_xx <= put(today(), yymmn6.) and
      xxxx.xx_ccyymm_xx <= put(intnx('year', today(), 1), yymmn6.)

Answer 2

You can use macro variables to hold the strings. You can use %SYSFUNC() to call the INTNX() function to adjust the date by months. You could use the automatic macro variable &SYSDATE9 to have the day your SAS session started in DATE9 format, or call the DATE() function to get the actual current date.

%let today=%sysfunc(date(),date9);

Then you can generate your YYYYMM format strings from that.

%let current_month=%sysfunc(putn("&today"d,yymmn6));
%let start_month=%sysfunc(intnx(month,"&today"d,-11),yymmn6);

Then in your query use the macro variables

where myvar between "&start_month" and "&current_month"

Answer 3

If you want to have it apply based on run-time:

xxxx.xx_ccyymm_xx between
  left(convert(varchar,dateadd(month,-11,getdate()),112),6)
    and 
  left(convert(varchar,getdate(),112),6)