Table with automatic update for 30 days

[CADSP]

Hi guys,

First excuse my english.

I am new to the SAS world, and I have a project to try to develop. I have doubts about where to start, or what issues to look for to solve it.

What I have:
A table from a server that I remove with proc sql, with the daily variables: Data, QTVenda

Data	QTVenda
19/05/2020	35
20/05/2020	234
21/05/2020	12
22/05/2020	456
23/05/2020	789
24/05/2020	122
25/05/2020	321
26/05/2020	987
27/05/2020	432

The first step would be to create two columns with QTVenda values ​​from 3 and 5 days ago, with reference to the line day.

Data	QTVenda	d_3	d_5
19/05/2020	35	66	112
20/05/2020	234	25	125
21/05/2020	12	12	66
22/05/2020	456	35	25
23/05/2020	789	234	12
24/05/2020	122	12	35
25/05/2020	321	456	234
26/05/2020	987	789	12
27/05/2020	432	122	456
28/05/2020		321	789
29/05/2020		987	122
30/05/2020		432	321
31/05/2020			987
01/06/2020			432

After that, I will use an accounting calculation for the QTVenda value of 28-05-2020 (current day) that takes into account d_3 and d_5. E I need this table to be updated with the calculated values ​​of QtSale, d_3 and d_5, up to 30 days ahead of today, in the example it would be 27-06-2020. So that every day I run the code and the table always updates to start 9 days before today and end 30 days after today.

Which features of SAS Guide 7 can I use to try to do this?

[ChrisNZ]

Like this?

data WANT; 
  set HAVE;
  where DATA between today()-9 and today()+30 ;
  D_3=lag3(QTVenda);
  D_5=lag5(QTVenda);
run;

[ChrisNZ]

Or maybe

data WANT; 
  set HAVE;
  where DATA between today()-9-5 and today()+30 ;
  D_3=lag3(QTVenda);
  D_5=lag5(QTVenda);
  if DATA > today()-9 ;
run;