MS Access Pass Through Query find duplicates using multiple tables - sql

Question

I'm trying to find all coverage_set_id with more than one benefit_id attached summary_attribute (value=2004687).
The query seems to be working fine without the GROUP BY & HAVING parts, but once I add those lines in (for the COUNT) my results are incorrect. Just trying to get duplicate coverage_set_id.
Pass-Through query via OBDC database:
SELECT DISTINCT
b.coverage_set_id,
COUNT (b.coverage_set_id) AS "COUNT"
FROM
coverage_set_detail_view a
JOIN contracts_by_sub_group_view b ON b.coverage_set_id = a.coverage_set_id
JOIN request c ON c.request_id = b.request_id
WHERE
b.valid_from_date BETWEEN to_date('10/01/2010','mm/dd/yyyy')
AND to_date('12/01/2010','mm/dd/yyyy')
AND c.request_status = 1463
AND summary_attribute = 2004687
AND benefit_id <> 1092333
GROUP BY
b.coverage_set_id
HAVING
COUNT (b.coverage_set_id) > 1
My results look like this:
-----------------------
COVERAGE_SET_ID | COUNT
-----------------------
4193706 | 8
4197052 | 8
4193926 | 112
4197078 | 96
4174168 | 8
I'm expecting all the COUNTs to be 2.
::EDIT::
Solution:
SELECT
c.coverage_set_id AS "COVERAGE SET ID",
c1.description AS "Summary Attribute",
count(d.benefit_id) AS "COUNT"
FROM (
SELECT DISTINCT coverage_set_id
FROM contracts_by_sub_group_view
WHERE
valid_from_date BETWEEN '01-OCT-2010' AND '01-DEC-2010'
AND request_id IN (
SELECT request_id
FROM request
WHERE request_status = 1463)
) a
JOIN coverage_set_master e ON e.coverage_set_id = a.coverage_set_id
JOIN coverage_set_detail c ON c.coverage_set_id = a.coverage_set_id
JOIN benefit_summary d ON d.benefit_id = c.benefit_id
AND d.coverage_type = e.coverage_type
JOIN codes c1 ON c1.code_id = d.summary_attribute
WHERE
d.summary_attribute IN (2004687, 2004688)
AND summary_structure = 1000217
GROUP BY c.coverage_set_id, c1.description
HAVING COUNT(d.benefit_id) > 1
ORDER BY c.coverage_set_id, c1.description
And these were the results:
COVERAGE SET ID | SUMMARY ATTRIBUTE | COUNT
-------------------------------------------------
4174168 | INPATIENT | 2
4174172 | INPATIENT | 2
4191828 | INPATIENT | 2
4191832 | INPATIENT | 2
4191833 | INPATIENT | 2
4191834 | INPATIENT | 2
4191838 | INPATIENT | 2
4191842 | INPATIENT | 2
4191843 | INPATIENT | 2
4191843 | OUTPATIENT | 2
4191844 | INPATIENT | 2
4191844 | OUTPATIENT | 2

Answer 1

The coverage_set_id in both the HAVING and count part of the SELECT should be benefit_id.
Since benefit_id is also in table a you can do the following
SELECT
a.coverage_set_id,
COUNT (a.benefit_id) AS "COUNT"
FROM
coverage_set_detail_view a
WHERE
a.coverage_set_id in (
SELECT b.coverage_set_id
FROM contracts_by_sub_group_view b
WHERE b.valid_from_date BETWEEN to_date('10/01/2010','mm/dd/yyyy') AND to_date('12/01/2010','mm/dd/yyyy'))
AND a.coverage_set_id in (
SELECT b2.coverage_set_id
FROM contracts_by_sub_group_view b2
INNER JOIN request c on c.request_id=b2.request_id
WHERE c.request_status = 1463)
AND ?.summary_attribute = 2004687
AND a.benefit_id <> 1092333
GROUP BY
a.coverage_set_id
HAVING
COUNT (a.benefit_id) > 1
This removes the JOIN magnification that was occurring on the FROM since those tables are not needed to pull coverage_set_id and benefit_id. The only remaining need for the other 2 tables is to filter out data based on criteria, which is in the WHERE clause.
I'm not sure what table summary_attribute lives in but it would follow a similar pattern to valid_from_date, request_status, or benefit_id.