Overwrite check in and check out dates with first in and last out

[he_ko]

Hi friends,

I'm running into a problem working with records that involve consecutive check in and check out dates. I have several lines per individual "stay." I want to select the first check in date and the last check out date and overwrite the rest of the dates for my analysis. I do not want to collapse/deduplicate the lines--I still want the same number of rows, but just the full date period. I have already written code to select the first check in, but can't figure out how to overwrite with the last check out.

Example:

LastName	FirstName	Check_in	Check_out
Bieber	Justin	14-Feb-13	22-Feb-13
Bieber	Justin	14-Feb-13	16-Mar-13
Bieber	Justin	14-Feb-13	21-Mar-13
Spears	Britney	29-Mar-13	5-Apr-13
Ocean	Frank	17-May-13	28-May-13
West	Kanye	24-Aug-13	25-Aug-13
West	Kanye	24-Aug-13	26-Aug-13
West	Kanye	24-Aug-13	29-Aug-13
West	Kanye	24-Aug-13	30-Aug-13

This is what I want it to look like:

LastName	FirstName	Check_in	Check_out
Bieber	Justin	14-Feb-13	21-Mar-13
Bieber	Justin	14-Feb-13	21-Mar-13
Bieber	Justin	14-Feb-13	21-Mar-13
Spears	Britney	29-Mar-13	5-Apr-13
Ocean	Frank	17-May-13	28-May-13
West	Kanye	24-Aug-13	30-Aug-13
West	Kanye	24-Aug-13	30-Aug-13
West	Kanye	24-Aug-13	30-Aug-13
West	Kanye	24-Aug-13	30-Aug-13

Can anybody help me out??

Hopefully!

[Reeza]

That's a bit of a weird request but ok...

SQL works well here. Use the Select * to select all level records and then use the max/min to get the earliest/latest dates in your dataset.

proc sql;
create table want as
select *, min(check_in) as check_in_start, max(check_out) as check_out_end
from have
group by lastName, FirstName
order by lastName, FirstName, check_in;
quit;

[he_ko]

Oh! This is really close to what I am looking for, however there is one problem (my apologies, I should have considered this before!).

If the same person has a new stay (involving new check in date), I would want to retain those visits as separate. Example:

LastName	FirstName	Check_in	Check_out
Bieber	Justin	14-Feb-13	22-Feb-13
Bieber	Justin	14-Feb-13	16-Mar-13
Bieber	Justin	14-Feb-13	21-Mar-13
Dion	Celine	29-Mar-13	5-Apr-13
Houston	Whitney	17-May-13	28-May-13
Bieber	Justin	24-Aug-13	25-Aug-13
Bieber	Justin	24-Aug-13	26-Aug-13
Bieber	Justin	24-Aug-13	29-Aug-13
Bieber	Justin	24-Aug-13	30-Aug-13

To this:

LastName	FirstName	Check_in	Check_out
Bieber	Justin	14-Feb-13	21-Mar-13
Bieber	Justin	14-Feb-13	21-Mar-13
Bieber	Justin	14-Feb-13	21-Mar-13
Dion	Celine	29-Mar-13	5-Apr-13
Houston	Whitney	17-May-13	28-May-13
Bieber	Justin	24-Aug-13	30-Aug-13
Bieber	Justin	24-Aug-13	30-Aug-13
Bieber	Justin	24-Aug-13	30-Aug-13
Bieber	Justin	24-Aug-13	30-Aug-13

I should note that I also have unique id numbers for these individuals.

P.S. Thank you for your high tolerance for the obsurity of my request!

[Reeza · Accepted solution]

Whatever your 'grouping' variables are, add them to the GROUP statement.

[he_ko]

There we go! Thank you!