Using coalesce with left joins to populate master table with most recent data - sql

I have 3 tables, 1 master and 2 tables containing the most recent data that should be populated (update) into the master table.
For this I need to create a transform view, that left joins the two tables with the master. For each value I should use the COALESCE function to always pick the value from one of the two tables with the most recent data, before the value in the master table.
Some fields only exist in the master table and some needs to be updated with the new data from the two other tables.
So far I've been using the COALESCE function like so:
COALESCE(System.tMirror_Roadpiece.Roadcode, System.tMirror_MasterTable.Roadcode)
This should select the value from the tMirror_Roadpiece table if it is not null.
My problem is that I am unsure how to correctly join the tables, while making sure my COALESCE functions work as intended.
Currently my joins look like this:
FROM [System].[tMirror_Roadpiece]
left join System.tMirror_MasterTable on System.tMirror_Roadpiece.Id = System.tMirror_MasterTable.Id
left join System.tMirror_Zipcodes on System.tMirror_MasterTable.Zipcode = System.tMirror_Zipcodes.Zipcode
But when I execute my SELECT statement I get no data back. How should I best structure my joins to update my master table with the data in the other two tables? One table is joined on the Id, while the other is joined on Zipcode.
My intended output is a master table with relevant data updated from the two other tables, while leaving the rest of the data in the master untouched.
Let me know if you need more information.
Edit: Sample data
Master table data (CSV):
123,1,2015-05-07T13:00:48.623,2015-05-07T13:00:48.623,3446,Hospitalsringen,Hospitalsringen,68,,,,5260,Odense S,,,0461,Odense,350455,"Hollufgård Hgd., Fraugde",1f,704050,590541.26,6135939.39,55.36141744,10.42832236,A,5,TN,200,100m_61359_5905,1km_6135_590,10km_613_59,2015-05-07T13:00:49.533,00000667-2566-47c9-9ba0-f5ec6b8ce50f,1,2015-05-07T13:00:48.533,2018-07-04T18:00:00.000,1083,Region Syddanmark,"Hollufgård Hgd., Fraugde",04613436__68_______,9148,Tornbjerg,1465,Fyns Politi,1135,Retten i Odense,0043,Odense Syd,Byzone,350455,1f,704050,04613436__68,22.1,d90e9338-0470-41bc-8ecb-6f71dd912ff0,11604d86-af45-11e7-847e-066cff24d637,Ekstern,B,V0,10.42845878,55.36232181,25,Rosengårdskolen,1,,02da5b79-929c-f1b5-e053-d280220ac400
Edit: SQL code
SELECT System.tMirror_MasterTable.[Infohub_RowId]
,System.tMirror_MasterTable.[Infohub_CreatedDate]
,System.tMirror_MasterTable.[Infohub_ValidityDate] AS [Infohub_ModifiedDate]
,System.tMirror_MasterTable.Infohub_HasChanged
,COALESCE(System.tMirror_Roadpiece.Id, System.tMirror_MasterTable.Id)
,[Status]
,System.tMirror_MasterTable.[Oprettet]
,System.tMirror_MasterTable.[Aendret]
,COALESCE(System.tMirror_Roadpiece.Vejkode, System.tMirror_MasterTable.Vejkode)
,COALESCE(System.tMirror_Roadpiece.Vejnavn, System.tMirror_MasterTable.Vejkode)
,COALESCE(System.tMirror_Zipcodes.Zipcode, System.tMirror_MasterTable.Zipcode)
,COALESCE(System.tMirror_Zipcodes.Zipcodenavn, System.tMirror_MasterTable.Zipcodenavn)
,COALESCE(System.tMirror_Roadpiece.Kommunekode, System.tMirror_MasterTable.Kommunekode)
,System.tMirror_MasterTable.[Kommunenavn]
,System.tMirror_MasterTable.[Regionskode]
,System.tMirror_MasterTable.[Regionsnavn]
,COALESCE(System.tMirror_Roadpiece.Navngivenvej_id, System.tMirror_MasterTable.Navngivenvej_id)
FROM
[System].[tMirror_Roadpiece] left join System.tMirror_MasterTable on System.tMirror_Roadpiece.Id = System.tMirror_MasterTable.Id
left join System.tMirror_Zipcodes on System.tMirror_MasterTable.Zipcode = System.tMirror_Zipcodes.Zipcode
WHERE
System.tMirror_MasterTable.Infohub_HasChanged = 1

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