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I have a query that uses two SELECT statements that are combined using a UNION ALL. Both statements pull data from similar tables to populate the query results. I am attempting to remove the "semi-duplicate" rows from the query, but am having issues doing so.

My query is the following:

 SELECT DISTINCT * FROM ( SELECT TeamNum = CASE WHEN T.TeamName = 'Alpha Team' THEN '1' WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') THEN '2' WHEN T.TeamName = 'Delta Team' THEN '3' ELSE '<Undefined>' END, P.PatientLastName AS LastName, P.PatientFirstName AS FirstName, R.PrimaryCity AS City, ReimbursorName = CASE WHEN RE.ReimbursorDescription = 'Medicare' Then 'R1' WHEN RE.ReimbursorDescription = 'Medicaid' Then 'R2' ELSE 'R3' END, P.PatientID AS PatientID FROM PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, PatReferrals PR LEFT OUTER JOIN PatReimbursors PRE ON PR.PatientID = PRE.PatientID, PatReimbursors PRE LEFT OUTER JOIN Reimbursors RE ON PRE.ReimbursorID = RE.ReimbursorID, PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID, WHERE PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 AND PR.Status <> 'R' AND PRE.CoveragePriority = '1' AND PRE.ExpirationDate IS NULL UNION ALL SELECT TeamNum = CASE WHEN T.TeamName = 'Alpha Team' THEN '1' WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') THEN '2' WHEN T.TeamName = 'Delta Team' THEN '3' ELSE '<Undefined>' END, P.PatientLastName AS LastName, P.PatientFirstName AS FirstName, R.PrimaryCity AS City, ReimbursorName = CASE WHEN RE.ReimbursorDescription = 'Medicare' Then 'E1' WHEN RE.ReimbursorDescription = 'Medicaid' Then 'E2' ELSE 'E3' END, P.PatientID AS PatientID FROM PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, PatReferrals PR LEFT OUTER JOIN PatEligibilities PE ON PR.PatientID = PE.PatientID, PatEligibilities PE LEFT OUTER JOIN Reimbursors RE ON PE.ReimbursorID = RE.ReimbursorID, PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID, WHERE PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 AND PR.Status <> 'R' AND PE.Status <> 'V' AND PE.ApplicationDate BETWEEN DATE(PR.ReferralDate)-5 AND DATE('2100/01/01') ) AS DUMMYTBL ORDER BY DUMMYTBL.LastName ASC, DUMMYTBL.FirstName ASC

The results that I receive when I run the query is the following:

3 Doe Jane Town R1 19874 1 Roe John City R3 50016 1 Roe John City E1 50016 2 Smith Jane Town E3 33975

The data that I am needing to remove is duplicate rows based on a certain criteria once the results are brought in from the original query. Each person can only be listed once and they must have a single pay source (R1, R2, R3, E1, E2, E3). If there is a R#, than there cannot be a E# listed for that person. If there are no R#'s than an E# must be listed. As shown in my example results, line 2 and 3 have the same person listed, but two pay sources (R3 and E1).

How can I go about making each person have only one row shown using the criteria that I have listed?

EDIT: Modifed the SQL query to show the original variables from the WHERE clauses in order to show further detail on the query. The PatReimbursors and the PatEligibilities tables have similar data, but the criteria is different in order to pull the correct data.

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  • TeamNum = T.TeamName,? Is that a typo? Commented Mar 21, 2013 at 15:55
  • Is this really a working query? The from clauses appear to have multiple occurences of the same aliases - it looks as though this could never run. Also, if there are multiple 'R' sources, which is to take precedence? Commented Mar 21, 2013 at 15:59
  • @Rachcha - I shortened that part of the query as it originally was a CASE statement to return numbers from the TeamName. @Mark Bannister - Yes, this query actually works. Commented Mar 21, 2013 at 16:00

3 Answers 3

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Your query does not make sense. I would start by eliminating the implicit cartesian product, generated by the , in the from clause.

My guess is that the from clause should be:

FROM PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID left outer join Rolodex R ON P.RolodexID = R.RolodexID left outer join PatEligibilities PE ON PR.PatientID = PE.PatientID left outer join Reimbursors RE ON PE.ReimbursorID = RE.ReimbursorID left outer join Teams T ON PR.TeamID = T.TeamID

Once you do this, you may not need the union all or the select distinct. You may be able to put both the reimbursors and the eligibilities in the same query.

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The PatReferrals table forks off to both PatReimbursors and PatEligibilities. In order to get both values to populate in the same query, a UNION of two similar SELECT statements had to inserted. Without that I would either get data from the PatReimbursors or PatEligibilities but not both.
That's fine. That prevents one type of cartesian product. However, you have introduced multiple others by including ","s in the from clause.
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Use a subquery or subqueries.

The overall query should be written using the following pattern:

 Select Distinct [Person Data] From PersonTable left Join to otherTable1 -- add outer join for each table you need data from On [Conditions that ensure join can generate only one row per person, ... and specify which of possibly many rows to get...]

Make sure the conditions eliminate any possibility for the join to generate more than one row from the other [outer] table per person row in in the person table,. This may (and often does) require that the join condition be based on a subquery, as, for example...

 Select Distinct [Person Data] From PersonTable p left Join to employments e -- add outer join for each table you need data from On e.PersonId = p.PersonId and e.HireDate = (Select Max(hiredate) from employments where personId = p.PersonId)
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After working with this for quite some time today, I found a solution to the problem that I was having. Here is the solution that works and pulls the correct information that I was needing:

SELECT DISTINCT TeamNum, LastName, FirstName, City, ReimbursorName = CASE WHEN max(ReimbursorName) IN ('R1', 'E1') THEN '1' WHEN max(ReimbursorName) IN ('R2', 'E2') THEN '2' ELSE '3' END, PatientID FROM ( SELECT TeamNum = CASE WHEN T.TeamName = 'Alpha Team' THEN '1' WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') THEN '2' WHEN T.TeamName = 'Delta Team' THEN '3' ELSE '<Undefined>' END, P.PatientLastName AS LastName, P.PatientFirstName AS FirstName, R.PrimaryCity AS City, ReimbursorName = CASE WHEN RE.ReimbursorDescription = 'Medicare' Then 'R1' WHEN RE.ReimbursorDescription = 'Medicaid' Then 'R2' ELSE 'R3' END, P.PatientID AS PatientID FROM PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, PatReferrals PR LEFT OUTER JOIN PatReimbursors PRE ON PR.PatientID = PRE.PatientID, PatReimbursors PRE LEFT OUTER JOIN Reimbursors RE ON PRE.ReimbursorID = RE.ReimbursorID, PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID WHERE PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 AND PR.Status <> 'R' AND PRE.CoveragePriority = '1' AND PRE.ExpirationDate IS NULL UNION ALL SELECT TeamNum = CASE WHEN T.TeamName = 'Alpha Team' THEN '1' WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') THEN '2' WHEN T.TeamName = 'Delta Team' THEN '3' ELSE '<Undefined>' END, P.PatientLastName AS LastName, P.PatientFirstName AS FirstName, R.PrimaryCity AS City, ReimbursorName = CASE WHEN RE.ReimbursorDescription = 'Medicare' Then 'E1' WHEN RE.ReimbursorDescription = 'Medicaid' Then 'E2' ELSE 'E3' END, P.PatientID AS PatientID FROM PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, PatReferrals PR LEFT OUTER JOIN PatEligibilities PE ON PR.PatientID = PE.PatientID, PatEligibilities PE LEFT OUTER JOIN Reimbursors RE ON PE.ReimbursorID = RE.ReimbursorID, PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID WHERE PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 AND PR.Status <> 'R' AND PE.Status <> 'V' AND PE.ApplicationDate BETWEEN DATE(PR.ReferralDate)-5 AND DATE('2100/01/01') ) AS DUMMYTBL GROUP BY TeamNum, LastName, FirstName, City, PatientID ORDER BY DUMMYTBL.LastName ASC, DUMMYTBL.FirstName ASC

Thanks for all the responses that were provided.

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