Crystal Report: SQL Subquery Issue with 'null' Results - sql-server

Question

When I run the following SQL query in SMS, I correctly get "null" values in the second document_desc column (from patient_documents_1). This shows me that the patient documents that exist for a certain patient do not include the required bh_pharm document. Perfect!
SELECT
patients.last_name, patients.first_name,
patient_documents.document_description,
patient_documents_1.document_description
FROM patients
INNER JOIN patient_documents ON patients.pat_id = patient_documents.pat_id
LEFT OUTER JOIN (
select patient_documents.pat_id, patient_documents.document_description
from patient_documents where patient_documents.document_description = 'bh_pharm' )
as patient_documents_1 ON patients.pat_id = patient_documents_1.pat_id
WHERE
( patient_documents.timestamp >= {ts '2015-02-01 00:00:00'} AND patient_documents.timestamp < {ts '2015-03-01 00:00:00'} ) AND
patient_documents_1.document_description is null
How can I do this in a Crystal Report?
Everything I try results in an empty report. Either that or I have to include every record and every document description. I only want the report to show me what patients are missing the "bh_pharm" document. Can Crystal Reports handle 'null' results from a subquery or subreport?
Thanks in advance ...

Answer 1

Open the crystal report then there instead of selecting the tables select command and copy the same query there.
Now go design and generate the report.

Answer 2

Does it work without the LEFT JOIN to the subquery? Ie do you get results after taking out that join and all references to patient_documents_1?
If not, then make sure you are configuring crystal reports to query the SQL Server correctly.
Edit:
Does this work? It might be the curly braces but I also did some gratuitous rewriting...
WITH patient_documents_1 as
(
select patient_documents.pat_id
from patient_documents
where patient_documents.document_description = 'bh_pharm'
group by patient_documents.pat_id
),
noBH as (
SELECT
patients.last_name,
patients.first_name,
patients.pat_id
FROM patients
LEFT OUTER JOIN patient_documents_1 on patients.pat_id = patient_documents_1.pat_id
WHERE
patient_documents_1.document_description is null
)
Select
noBH.*,
patient_documents.document_description
from noBH
INNER JOIN patient_documents ON noBH.pat_id = patient_documents.pat_id
WHERE
patient_documents.timestamp between '2015-02-01' and '2015-02-28'
Oh yeah, are there patients who don't have the bh_pharm document but do have timestamps in feb 2015?

Answer 3

Start with a new report.
The only table you need to add to your report is the patients table. (If you alias it then make sure to change it in the query below.)
Add a SQL Expression to return the count. It will evaluate to zero when no documents with the right description are found. Copy everything below including the parentheses. Call it something like DocumentCount.
(
select count(*)
from patient_documents as pd
where
pd.document_description = 'bh_pharm'
and pd.pat_id = patients.pat_id /* alias on "patients" must match */
)
Add a filter to the record select formula to limit it to the ones you want to display.
{%DocumentCount} = 0