How can I get distinct data from one col - sql

Question

I need to get member personal data for all our members whose subscriptions have lapsed i.e. have a subscription end date before 31/03/2020, however I want to show one member record only (distinct by membership number) ideally the most recent one
I've tried a ROW_NUMBER() solution SQL - Distinct One Col, Select Multiple other? and a cross apply solution sql distinct, getting 2 columns but I can't get it to work.
SELECT membershipnumber AS Id,
subscription.enddate
FROM [dbo].[userprofile]
INNER JOIN dbo.subscription
ON userprofile.id = subscription.userprofileid
INNER JOIN dbo.subscriptiontype
ON subscriptiontype.id = subscription.subscriptiontypeid
Output is
Id Enddate
1 2006-04-01 00:00:00.000
1 2001-04-01 00:00:00.000
1 1999-04-01 00:00:00.000
1 1998-04-01 00:00:00.000
1 2008-04-01 00:00:00.000
1 2007-04-01 00:00:00.000
1 2011-04-01 00:00:00.000
1 2005-04-01 00:00:00.000
1 2000-04-01 00:00:00.000
1 1997-04-01 00:00:00.000
2 1999-04-01 00:00:00.000
2 2012-04-01 00:00:00.000
2 2004-04-01 00:00:00.000
2 2001-04-01 00:00:00.000
2 2018-04-01 00:00:00.000
2 2009-04-01 00:00:00.000
2 2005-04-01 00:00:00.000
2 1997-04-01 00:00:00.000
Desired output
Id Enddate
1 2011-04-01 00:00:00.000
2 2018-04-01 00:00:00.000

Answer 1

Solved sql answer
;WITH cte
AS (SELECT membershipnumber AS Id,
subscription.enddate,
Row_number()
OVER (
partition BY membershipnumber
ORDER BY subscription.enddate DESC) AS rownumber
FROM [dbo].[userprofile]
INNER JOIN dbo.subscription
ON userprofile.id = subscription.userprofileid
INNER JOIN dbo.subscriptiontype
ON subscriptiontype.id = subscription.subscriptiontypeid
)
SELECT *
FROM cte
WHERE rownumber = 1
https://stackoverflow.com/a/6841644/5859743

Answer 2

Not sure if I got your question right.
but you can use DISTINCT in the SELECT, that would show only one record for each member.
SELECT DISTINCT Membershipnumber as Id
,'P' as PartyType
,'A' as Status
,case
when Name = 'Standard Membership paid annually.' and EndDate > '2020-03-31' then 'Member'
when Name = 'Lapsed subscription renewal' and EndDate > '2020-03-31' then 'Member'
when Name = '3 Year Subscription (members outside of UK and Ireland, Jersey, Guernsey and the Channel Islands)' and EndDate > '2020-03-31' then 'Overseas member'
when Name = '1 Year Subscription (members outside of UK and Ireland, Jersey, Guernsey and the Channel Islands).' and EndDate > '2020-03-31' then 'Overseas member'
when Name = 'Lapsed subscription renewal' and EndDate > '2020-03-31' then 'Member'
when Name = 'Lifetime membership' then 'Lifetime member'
when Name = 'Retired membership paid annually' and EndDate > '2020-03-31' then 'Retired member'
else 'Non member'
end As MemberType
,Title as NamePrefix
,FirstName as FirstName
,Surname as LastName
,DateOfBirth as BirthDate
,'Home' as AddressPurpose
,'Default' as CommunicationReasons
,AddressLine1
,AddressLine2
,AddressLine3
,Addressline4 as CityName
,'' as CountrySubEntityName
,Country as CountryCode
,'' as CountryName
,Postcode as PostalCode
,EmailAddress as Email
FROM [dbo].[UserProfile]
inner join dbo.Subscription on
UserProfile.Id = Subscription.UserProfileId
inner join dbo.SubscriptionType on
SubscriptionType.id = Subscription.SubscriptionTypeId```

Answer 3

If you are getting as above mentioned output. Then from that, your desired output will easily get using distinct.
; with cte as (
----- query which gives you above mentioned output
)
select distinct id, max(Enddate) as Enddate from cte

Answer 4

I suspect you want something like this:
select *
from (select . . ., -- all the columns you want
row_number() over (partition by Membershipnumber as Id order by s.Enddate) as seqnum
from [dbo].[UserProfile] up inner join
dbo.Subscription s
on up.Id = s.UserProfileId inner join
dbo.SubscriptionType st
on st.id = s.SubscriptionTypeId
) x
where seqnum = 1;