Analytical query producing different result on joins

Question

Hi,
The queries below should have the same output but the first one just does a left join instead of a full join. Can you please help me figure out why ?
SELECT source_aa, source_bb, COUNT (*)
FROM (SELECT *
FROM (SELECT a_a.application_id,
'In_APPLICATION' AS source_aa,
RANK () OVER (PARTITION BY application_id ORDER BY date DESC) AS rank_aa
FROM application a_a)
WHERE rank_aa = 1) aa
FULL JOIN
(SELECT *
FROM (SELECT b_b.application_id,
'In_APPLICATION_ARCHV' AS source_bb,
RANK () OVER (PARTITION BY application_id ORDER BY date DESC) AS rank_bb
FROM application_archv b_b)
WHERE rank_bb = 1) bb
ON aa.application_id = bb.application_id
GROUP BY source_aa, source_bb;
SELECT source_aa, source_bb, COUNT (*)
FROM (SELECT DISTINCT application_id,'In_APPLICATION' AS source_aa
FROM application) aa
FULL JOIN
(SELECT DISTINCT application_id,'In_APPLICATION_ARCHV' AS source_bb
FROM application_archv) bb
ON aa.application_id = bb.application_id
GROUP BY source_aa, source_bb;
-----

Answer 1

Both your query does a FULL JOIN. But in the first query you have extra filter condition. You are geting only the latest application_id. Check this
<pre>
SELECT *
FROM (
SELECT b_b.application_id
, 'In_APPLICATION_ARCHV' AS source_bb
<font color=red>
, RANK () OVER (PARTITION BY application_id ORDER BY date DESC) AS rank_bb
</font>
FROM application_archv b_b
<font color=red>
WHERE rank_bb = 1
</font>
</pre>
The the code in red is the once thats causing the difference in output.