topic Re: Joining two tables on two variables in SAS Procedures

Joining two tables on two variables

Miracle — Fri, 16 Nov 2018 03:39:22 GMT

Hi SAS users,

I would like to join 2 tables on 2 variables limiting only the records from condition_concept table.

But the below code doesn't work.

Would you be able to point me out why?

Thank you.

CREATE TABLE criteria AS
	SELECT a.*, a.year AS condition_year, b.year AS visit_year 
	FROM condition a INNER JOIN visit b
	ON a.id=b.id AND a.visit_id=b.visit_id
	WHERE condition_id IN 
	(SELECT DISTINCT(target_id) FROM condition_concept)
	ORDER BY a.id

Re: Joining two tables on two variables

VDD — Fri, 16 Nov 2018 04:16:23 GMT

does your condition have a table that it is coming from is it table a or table b?

Re: Joining two tables on two variables

Astounding — Fri, 16 Nov 2018 04:30:05 GMT

If this were a DATA step instead of SQL, the answer would be very clear. Since it's SQL, however, you will have to check whether this is correct or not.

A stand-alone WHERE clause applies to both sources of data. Both CONDITION and VISIT would need to contain CONDITION_ID.

If it turns out that SQL follows the same rules, (and if CONDITION_ID appears in only one of the incoming data sets), you could get around the issue by using two CREATE statements.

CREATE statement #1: Create a view that subsets the records from one of the sources.

CREATE statement #2: Join that view with the other source.

Of course, if this is not the issue, it would be helpful for you to provide some details ... what doesn't work? Why is the result not what you want? The SAS log would help.

Re: Joining two tables on two variables

ballardw — Fri, 16 Nov 2018 17:17:51 GMT

Doesn't work is awful vague.

Are there errors in the log?: Post the code and log in a code box opened with the {i} to maintain formatting of error messages.

No output? Post any log in a code box.

Unexpected output? Provide input data in the form of data step code pasted into a code box, the actual results and the expected results. Instructions here: https://communities.sas.com/t5/SAS-Communities-Library/How-to-create-a-data-step-version-of-your-dat... will show how to turn an existing SAS data set into data step code that can be pasted into a forum code box using the {i} icon or attached as text to show exactly what you have and that we can test code against.

And you are using three tables. Perhaps you need to JOIN with the third table instead?