Hello again!
I would like to ask you how to get from "have" to "wanna" base.
Have:
Company, Year,
A,2001
A,2002
A,2003
A,2004
B,2001
B,2002
B,2003
C,2001
C,2002
C,2003
C,2004
Wanna:
Company, Year,
A,2001
A,2002
A,2003
A,2004
C,2001
C,2002
C,2003
C,2004
I know the logic, but cannot really figure out the code...
I should assign e.g. item for every observation and delete each company which has item number <4
Thank you in advance!
select * from have group by company having count(distinct year)=4;
Xia Keshan
Well, few ways to do it in SQL, heres one:
proc sql;
create table want as
select company,year
from (
select *
,count(1) as tmp
from have
group by company
)
where tmp=4;
quit;
data have;
input Company $ Year;
cards;
A 2001
A 2002
A 2003
A 2004
B 2001
B 2002
B 2003
C 2001
C 2002
C 2003
C 2004
;
run;
proc sql;
select * from have group by company having count(*)=4;
quit;
select * from have group by company having count(distinct year)=4;
Xia Keshan
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