SAS Mapping between two datasets - sas

Question

I’m trying to map between two datasets using SAS.
Dataset 1
ID Start_Date End Date
Aaa 1/1/2023 5/1/2023
Bbb 10/1/2023 1/2/2023
Ccc 15/1/2023 27/1/2023
Dataset 2
ID Date
Aaa 4/1/2023
Aaa 10/1/2023
Bbb 1/1/2023
Bbb 15/1/2023
Bbb 31/1/2023
Ccc 10/1/2023
I want to filter out all the rows in dataset2 that fits the time range (between start and end date) from dataset1 for each ID.
For this example, the output should be as following:
ID Date
Aaa 4/1/2023
Bbb 15/1/2023
Bbb 31/1/2023

Answer 1

Perhaps a simple inner join will give you the expected result
proc sql;
create table want as
select t2.*
from dataset1 t1
inner join dataset2 t2
on t1.id = t2.id
and t2.date between t1.start_date and t1.end_date
;
quit;
ID date
Aaa 04/01/23
Bbb 15/01/23
Bbb 31/01/23
If you have dates stored as a string instead (which seem to be the case following your desired output), consider using the input() function in the join
proc sql;
create table want as
select t2.*
from have1 t1
inner join have2 t2
on t1.id = t2.id
and input(t2.date, ddmmyy10.)
between input(t1.start_date, ddmmyy10.)
and input(t1.end_date, ddmmyy10.)
;
quit;
ID date
Aaa 4/1/2023
Bbb 15/1/2023
Bbb 31/1/2023

Answer 2

Try this
data one;
input ID $ (Start_Date End_Date)(:ddmmyy10.);
format Start_Date End_Date ddmmyy10.;
datalines;
Aaa 1/1/2023 5/1/2023
Bbb 10/1/2023 1/2/2023
Ccc 15/1/2023 27/1/2023
;
data two;
input ID $ Date :ddmmyy10.;
format Date ddmmyy10.;
datalines;
Aaa 4/1/2023
Aaa 10/1/2023
Bbb 1/1/2023
Bbb 15/1/2023
Bbb 31/1/2023
Ccc 10/1/2023
;
data want(keep = ID Date);
merge one two;
by ID;
if Start_Date <= Date <= End_Date;
run;

Answer 3

Using double set can solve this problem logically。
The first set is to load the dataset 2.And the second one is to load the range (datset 1).A if will only output the date that fitting the range.
Try this：
data dsout;
set ds2;
do i=1 to rec while(^eof);
set ds1(rename=(ID=ID_)) point=i nobs=rec end=eof;
if ID=ID_ and date>=Start_Date and date<=End_Date then do;
output;
leave;
end;
end;
drop Start_Date End_Date;
run;