Proc SQL missing or nonmissing?

[ybz12003]

Hello,

I created a PROC SQL code below.  I  found out that the result came out with missing data, I have restrict the Status=4, I don't understand why 'status=.' is still showing even though I have put 'Status=4 and Status ^=.'

So the strange thing is at the first beginning, I only put 'Status=4', then I found 'Status=.' was showing in the result.

Then I put 'Status=4 and Status ^=.',  I still found 'Status=.' was showing in the result.

Really beats me!

proc sql;
	create table want as
 	select site, id, CultureDate,AdmitDate,VisitDate,Culture
 	from have
 	where Status = 4 and Status ^=. and Culture = 1 and VisitDate ne . and AdmitDate ne .
			and CultureDate ne . and CultureDate ^= '01Jan8888'd 
			and ((CultureDate lt VisitDate) or (CultureDate gt AdmitDate+3))
 	order by site, id;
quit;

[FreelanceReinh · Accepted solution]

Hello @ybz12003,

How did you determine the value of STATUS for an observation in dataset WANT, given that STATUS is not among the variables listed in your SELECT statement and hence will not be contained in WANT?

[ybz12003]

LOL!  Thank you so much!