topic Re: Proc SQL linking on dates 1 day apart? in SAS Programming

Proc SQL linking on dates 1 day apart?

shellp55 — Sat, 16 Sep 2017 04:11:23 GMT

Hello

I am using SAS 9.3.

I have inpatient and outpatient data. I want to link the Emergency Room abstract with the inpatient one for those admitted via the ER. However, the admit date of the inpatient visit could be a day later than the end date of the ER abstract. Is there any way to do this?

The ED table only has those visits admitted and the inpatient cases only have those admitted via the ED. The current resulting dataset is missing out on those where the ED end date is a day later i.e. the inpatient admit date is April 10, 2017 and the ED end date is April 11, 2017.

My current code:

proc sql;
create table Links as select
a.HCN,
a.alias,
a.admdate,
b.regdate,
b.triage
from inpatients as a
left join ED as b
on a.HCN = b.HCN 
and b.enddate<=a.admdate<=b.enddate+1;

Any and all assistance greatly appreciated.

Re: Proc SQL linking on dates 1 day apart?

PGStats — Sat, 16 Sep 2017 05:17:09 GMT

Try the join condition

on a.HCN = b.HCN
and a.admdate between b.enddate and b.enddate+1

Re: Proc SQL linking on dates 1 day apart?

Reeza — Sat, 16 Sep 2017 06:08:46 GMT

Is it a date or date time variable? I thought it was usually DT. It's also really rare but it can be longer than a day.

Re: Proc SQL linking on dates 1 day apart?

shellp55 — Sat, 16 Sep 2017 17:54:55 GMT

Thanks to you both for responding. I worked on it last night and I created a new field called "d_date" that was the +1 and added as an OR statement. So PGStats response but instead of using "+1" I built that as a field elsewhere.

Thanks so much!