Duplicate Results with LISTAGG Function - sql

Question

I do see there are solutions for a similar question but I was unable to get them to work in my scenario.
I am returning duplicate codes while using the LISTAGG function.
Returning now:
SELECT
,CD.CLAIM
,CD.CLAIMLN
,CD.PROV_INVOICE_UNTS
,CD.APPR_UNTS
,CD.PROV_INVOICE_AMT
,CD.PROV_CNTRCT_AMT
,CD.PLAN_CNTRCT_AMT as PLAN_AMT
,LISTAGG(DX.DIAG_CD,', ') WITHIN GROUP (ORDER BY DX.LVL_CD) AS DX_CODES
FROM CLAIM_DETAIL CD
INNER JOIN PATIENT_INTAKE_PLAN PIP
ON CD.PAT_NBR = PIP.PAT_NBR AND CD.ITK_ID = PIP.ITK_ID
INNER JOIN HEALTH_PLAN HP
ON HP.PLAN_ID = PIP.PLAN_ID
INNER JOIN PROVIDER_CCXPORTAL PR
ON PR.PROV_ID = CD.PROV_ID
INNER JOIN PROVIDER_PARENT PRP
ON PR.PROV_PRNT_ID = PRP.PROV_PRNT_ID
INNER JOIN PATIENT_CCXPORTAL PTP
ON PTP.PAT_NBR = CD.PAT_NBR
INNER JOIN CLAIM C
ON C.CLM_ID = CD.CLM_ID
LEFT JOIN CLAIM_DIAGNOSIS DX
ON CD.CLM_ID = DX.CLM_ID
WHERE
C.RCPT_DT >= '01-JUL-2014'
I need it to return:

Answer 1

Use a regex to get rid of the duplicates
....as PLAN_AMT,
RTRIM(
REGEXP_REPLACE(
(listagg(DX.DIAG_CD,',') WITHIN GROUP (ORDER BY DX.LVL_CD) ),
'([^,]*)(,\1)+($|,)',
'\1\3'),
',') AS DX_CODES
FROM......

Answer 2

If there are very many DX_CODES per claim, your may string exceed the max length for a SQL varchar2.
Can you try this instead?
SELECT
,CD.CLAIM
,CD.CLAIMLN
,CD.PROV_INVOICE_UNTS
,CD.APPR_UNTS
,CD.PROV_INVOICE_AMT
,CD.PROV_CNTRCT_AMT
,CD.PLAN_CNTRCT_AMT as PLAN_AMT
, (SELECT listagg(dx.diag_cd,',') within group ( order by dx.lvl_cd, dx.diag_cd ) FROM ( SELECT distinct clm_id, lvl_cd, diag_cd FROM claim_diagnosis ) dx WHERE dx.clm_id = cd.clm_id ) dx_codes
--,LISTAGG(DX.DIAG_CD,', ') WITHIN GROUP (ORDER BY DX.LVL_CD) AS DX_CODES
FROM CLAIM_DETAIL CD
INNER JOIN PATIENT_INTAKE_PLAN PIP
ON CD.PAT_NBR = PIP.PAT_NBR AND CD.ITK_ID = PIP.ITK_ID
INNER JOIN HEALTH_PLAN HP
ON HP.PLAN_ID = PIP.PLAN_ID
INNER JOIN PROVIDER_CCXPORTAL PR
ON PR.PROV_ID = CD.PROV_ID
INNER JOIN PROVIDER_PARENT PRP
ON PR.PROV_PRNT_ID = PRP.PROV_PRNT_ID
INNER JOIN PATIENT_CCXPORTAL PTP
ON PTP.PAT_NBR = CD.PAT_NBR
INNER JOIN CLAIM C
ON C.CLM_ID = CD.CLM_ID
--LEFT JOIN CLAIM_DIAGNOSIS DX
--ON CD.CLM_ID = DX.CLM_ID
WHERE
C.RCPT_DT >= '01-JUL-2014'
Make sure there is an index on CLAIM_DIAGNOSIS.CLM_ID.