How do I change this sql statement to only select the first from each ID? - sql

Question

I have the below code to select from a database, however, I only want the first record for each unique ID. Is there a way to change the SQL to achieve this?
SELECT
[CARL_Property].ID
,[PrDoorNum]
,[PrAddress1]
,[PrAddress2]
,[PrAddress3]
,[PrAddress4]
,[PrPostcode]
,[PrRent]
,[PrAgreedRent]
,[PrCommence]
,[PrEnd]
,[PrAvailable]
,[PrGrossIncome]
,[PrCouncilTax]
,[PrInventoryFee]
,[PrLetFee]
,[PrReletFee]
,[PrDateWithdrawn]
,[Rent Review]
,CARL_Owners.OwForenames
,CARL_Owners.OwSurname
,CARL_Property_List.[ID]
,CARL_Property_List.[PrId]
,CARL_Property_List.[PLBedrooms]
,CARL_Property_List.[PlRooms]
,CARL_Property_List.[PlBathrooms]
,CARL_Property_List.[PlReceptions]
,CARL_Property_List.[PlDeposit]
,CARL_Tenant_Contacts.[Tenant Name]
,CARL_New_Tenants.[TnLeaseperiod]
,CARL_Property_List.[PlAdvertising]
,[CARL_Property_Memos].[PrNotes]
,[CARL_Safety].[PrGasInsp]
from dbo.CARL_Property Join dbo.[CARL_Property_Memos] on CARL_Property.ID=CARL_Property_Memos.PrID Join dbo.CARL_Owners on CARL_Owners.ID=CARL_Property.OwID Join dbo.CARL_PROPERTY_LIST ON dbo.CARL_PROPERTY.ID=dbo.CARL_PROPERTY_LIST.PrId Join dbo.[CARL_New_Tenants] ON CARL_New_Tenants.PrId=CARL_Property.ID JOIN CARL_Tenant_Contacts ON CARL_New_Tenants.ID = CARL_Tenant_Contacts.TnID Join [dbo].[CARL_Safety] On dbo.CARL_Property.ID=dbo.CARL_Safety.PrID
The result is as seen below.

Answer 1

Something along these lines I think is what you are looking for. Also, notice that I used aliases in your main query. It makes this a lot simpler to work with and reduces the amount of typing by a LOT.
with SortedResults as
(
SELECT
cp.ID
, ROW_NUMBER() over(partition by cp.ID order by pl.ID) as RowNum --order by whatever column defines "first"
, [PrDoorNum]
, [PrAddress1]
, [PrAddress2]
, [PrAddress3]
, [PrAddress4]
, [PrPostcode]
, [PrRent]
, [PrAgreedRent]
, [PrCommence]
, [PrEnd]
, [PrAvailable]
, [PrGrossIncome]
, [PrCouncilTax]
, [PrInventoryFee]
, [PrLetFee]
, [PrReletFee]
, [PrDateWithdrawn]
, [Rent Review]
, o.OwForenames
, o.OwSurname
, pl.[ID] as PL_ID
, pl.[PrId]
, pl.[PLBedrooms]
, pl.[PlRooms]
, pl.[PlBathrooms]
, pl.[PlReceptions]
, pl.[PlDeposit]
, tc.[Tenant Name]
, nt.[TnLeaseperiod]
, pl.[PlAdvertising]
, pm.[PrNotes]
, cs.[PrGasInsp]
from dbo.CARL_Property p
Join dbo.[CARL_Property_Memos] pm on p.ID = pm.PrID
Join dbo.CARL_Owners o on o.ID = p.OwID
Join dbo.CARL_PROPERTY_LIST pl ON p.ID = pl.PrId
Join dbo.[CARL_New_Tenants] nt ON nt.PrId = p.ID
JOIN CARL_Tenant_Contacts tc ON nt.ID = tc.TnID
Join [dbo].[CARL_Safety] cs On p.ID = cs.PrID
)
select *
from SortedResults
where RowNum = 1
order by ID