concatenate macro variable with conditional rule

[Ronein]

Hello

I want to create a macro variable called vector .

Condition 1:

If data set transtbl doesn't exist then  vector will get value of 2009+2010+.....+....+current month

(For example: ?If current month is July 2021 then the macro variable will get value  2009+2010+2011+2012+2101+2102+2103+2104+2105+2106+2107)

Condition 2:

If data set  transtbl exists then vector will get value of  : 

one month after min month in data set transtbl +.....................+  current month

(so for example if min month of field date in data set transtbl is 02Mar2021  and current month is July 2021 then vector will get value  2103+2104+2105+2106+2107 

Data transtbl ;
Format date date9.;
Input Id date : date9. amount;
cards;
1 18MAY2021 100
2 21FEB2021 200
3 08FEB2021 300
4 11MAR2021 100
5 27FEB2021 400
6 02FEB2021 800
7 20JUN2021 900
8 29MAY2021 100
9 17FEB2021 200
10 15FEB2021 300
;
Run;

[Tom]

So what did you try?  How did it not work?

You seem to have left out a key piece of information.  What is the meaning of those four digit strings between the plus signs?

Are we supposed to guess what they mean?