if more than 1 match, do not return 'unknown' - sql

Question

I composed a monster query. I'm certain that it can be optimized, and I would more than appreciate any comments/guidance on the query itself; however, I have a specific question:
The data I am returning is sometimes duplicated on multiple columns:
+-------+------+----------+------+-------+--------+----------+-------+------+
| first | last | deaID | cert | count | npi | clientid | month | year |
+-------+------+----------+------+-------+--------+----------+-------+------+
| Alex | Jue | UNKNOWN | MD | 11 | 123123 | 102889 | 7 | 2012 |
| Alex | Jue | BJ123123 | MD | 11 | 123123 | 102889 | 7 | 2012 |
+-------+------+----------+------+-------+--------+----------+-------+------+
as you can see all of the fields are equal except for deaID
in this case, I would like to only return:
+------+-----+----------+----+----+--------+--------+---+------+
| | | | | | | | | |
+------+-----+----------+----+----+--------+--------+---+------+
| Alex | Jue | BJ123123 | MD | 11 | 123123 | 102889 | 7 | 2012 |
+------+-----+----------+----+----+--------+--------+---+------+
however, if there are no duplicates:
+-------+------+---------+------+-------+--------+----------+-------+------+
| first | last | deaID | cert | count | npi | clientid | month | year |
+-------+------+---------+------+-------+--------+----------+-------+------+
| Alex | Jue | UNKNOWN | MD | 11 | 123123 | 102889 | 7 | 2012 |
+-------+------+---------+------+-------+--------+----------+-------+------+
then i would like to keep it!
summary
if there are duplicates remove all records with 'deaID=unknown'; however, if there is only 1 match then return that match
question
how do i return unknown records IFF there is 1 match?
here is the monster query in case anybody is interested :)
with ctebiggie as (
select distinct
p.[IMS_PRESCRIBER_ID],
p.PHYSICIAN_NPI as MLISNPI,
a.CLIENT_ID,
p.MLIS_FIRSTNAME,
p.MLIS_LASTNAME,
p_address.IMS_DEA_NBR,
p.IMS_PROFESSIONAL_ID_NBR,
p.IMS_PROFESSIONAL_ID_NBR_src,
p.IMS_CERTIFICATION_CODE,
datepart(mm,a.RECEIVED_DATE) as [Month],
datepart(yyyy,a.RECEIVED_DATE) as [Year]
from
MILLENNIUM_DW_dev..D_PHYSICIAN p
left outer join
MILLENNIUM_DW_dev..F_ACCESSION_DAILY a
on a.REQUESTOR_NPI=p.PHYSICIAN_NPI
left outer join MILLENNIUM_DW_dev..D_PHYSICIAN_ADDRESS p_address
on p.PHYSICIAN_NPI=p_address.PHYSICIAN_NPI
where
a.RECEIVED_DATE is not null
--and p.IMS_PRESCRIBER_ID is not null
--and p_address.IMS_DEA_NBR !='UNKNOWN'
and p.REC_ACTIVE_FLG=1
and p_address.REC_ACTIVE_FLG=1
and DATEPART(yyyy,received_date)=2012
and DATEPART(mm,received_date)=7
group by
p.[IMS_PRESCRIBER_ID],
p.PHYSICIAN_NPI,
p.IMS_PROFESSIONAL_ID_NBR,
p.MLIS_FIRSTNAME,
p.MLIS_LASTNAME,
p_address.IMS_DEA_NBR,
p.IMS_PROFESSIONAL_ID_NBR,
p.IMS_PROFESSIONAL_ID_NBR_src,
p.IMS_CERTIFICATION_CODE,
datepart(mm,a.RECEIVED_DATE),
datepart(yyyy,a.RECEIVED_DATE),
a.CLIENT_ID
)
,
ctecount as
(select
COUNT (Distinct f.ACCESSION_ID) [count],
f.REQUESTOR_NPI,f.CLIENT_ID,
datepart(mm,f.RECEIVED_DATE) mm,
datepart(yyyy,f.RECEIVED_DATE)yyyy
from MILLENNIUM_DW_dev..F_ACCESSION_DAILY f
where
f.CLIENT_ID not in (select * from SalesDWH..TestPractices)
and DATEPART(yyyy,f.received_date)=2012
and DATEPART(mm,f.received_date)=7
group by f.REQUESTOR_NPI,
f.CLIENT_ID,
datepart(mm,f.RECEIVED_DATE),
datepart(yyyy,f.RECEIVED_DATE)
)
select ctebiggie.*,c.* from
ctebiggie
full outer join
ctecount c
on c.REQUESTOR_NPI=ctebiggie.MLISNPI
and c.mm=ctebiggie.[Month]
and c.yyyy=ctebiggie.[Year]
and c.CLIENT_ID=ctebiggie.CLIENT_ID

Answer 1

Assuming you have the base query, I will assign row_number and count by partition function over this resultset. Then on the outer select, if count is 1 then unknown is selected, else it is not selected.
SELECT first,
last,
deaID,
cert,
count,
npi,
clientid,
month,
year
FROM (
SELECT first,
last,
deaID,
cert,
count,
npi,
clientid,
month,
year,
ROW_NUMBER() OVER (PARTITION BY
first,last,cert,count,npi,clientid,month,year
ORDER BY CASE WHEN deaID = 'Unkown' THEN 0 ELSE 1 END,
deaID) AS RowNumberInGroup,
COUNT() OVER (PARTITION BY first,last,cert,count,npi,clientid,month,year)
AS CountPerGroup,
SUM(CASE WHEN deaID = 'Unkown' THEN 1 ELSE 0 END)
OVER (PARTITION BY first,last,cert,count,npi,clientid,month,year)
AS UnknownCountPerGroup
FROM BaseQuery
) T
WHERE (T.CountPerGroup = T.UnknownCountPerGroup AND T.RowNumberInGroup = 1) OR T.RowNumberInGroup > T.UnknownCountPerGroup

Answer 2

see this helps or not
select distinct main.col1,main.col2 ,
isnull(( select col3 from table1 where table1.col1=main.col1
and table1.col2=main.col2 and col3 <>'UNKNOWN'),'UNKNOWN')
from table1 main
Sample in Sql fiddle
or fair version of yours will be
SELECT distinct first,
last,
cert,
count,
npi,
clientid,
month,
year,
isnull(
select top 1 dealid from table1 intable where
intable.first=maintable.first and
intable.last=maintable.last and
intable.cert=maintable.cert and
intable.npi=maintable.npi and
intable.clientid=outtable.clientid and
intable.month=outtable.month and
intable.year=outtable.year
where dealid<>'UNKNOWN'),'UNKNOWN') as dealId
FROM table1 maintable