code=I48
-year=between 2010 and 2021
-count = 1(taking the medicine for the first time)
Using this example conditions, I already conducted query as follows.
 '''query code'''
 
 option compress=yes;
 libname p "/user/temp/data_source";

 proc sql;
 create table m_join as
 select index_num, R_key, patient_name from p.m1 as t1 join p.m2 as t2 
 on t1.index_num=t2.index_num join p.m3 as t3 join p.m4 as t4
 on t3.index_num=t4.index_num
 where stubstr(t4.nm_cd) in ("243tab" and "246tab")
 and count = "1"
 and t1.year=between "2010" and "2021"
 and disease_code = "I48"
 group by index_num;
 quit;

But this code inculdes some problems.
I don't know how to solve this problem.
Please, let me know how to solve this problem.

A: 

*Explain tables contents' so it is easier to give full SQL query.

*Format query so it is easier to read.

*If you need to find patients then group by patient.

*Condition on taking medicine is unclear. I will assume that we need to find a person who took the medicine like 243tab and 246tab eventually but the first time they took it was between 2010 and 2021.

*Use single quotes for literals.

*Write all join conditions.

*Do not use strings when compare years because years are numbers (I hope you store them as numbers).

*In clause requires to use commas to list values, not 'ands'.

*Use aliases every time. Again the code will be easier to read.

proc sql;
    create table m_join as
    select patient_name
    from p.m1 as t1
    join p.m2 as t2 
    on t1.index_num = t2.index_num
    join p.m3 as t3
    on???
    join p.m4 as t4
    on t3.index_num=t4.index_num
    where disease_code = 'I48'
        and t4.nm_cd in ('243tab', '246tab')
    group by patient_name
    having min(t4.year) between 2010 and 2021
    ;
quit;

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