SQL Subquery to replace all values - sql

Question

I have a query which returns a bunch of different data, however I want to have it replace all the values upon a certain condition.
What I have written below kind of gives me the result I want but not really. It creates a new column instead of replacing the other one:
SELECT
CASE
WHEN T4.[U_DestType] = '6'
THEN (SELECT
'Company Limited' AS [ShipToCode]
)
END AS [ShipToCode],
T2.[ShipToCode],
T6.[StreetS],
T6.[StreetNoS],
T6.[CityS],
T6.[ZipCodeS],
T6.[CountryS],
T5.[LicTradNum],
T2.[CardCode],
T4.[Phone1],
T4.[E_Mail],
T4.[U_DestType],
CASE
WHEN T4.[Country] = 'GB'
THEN 'EN'
ELSE T4.[Country]
END AS [Country],
T4.[U_ShortName]
FROM[...]
The end goal is to replace all of the columns with some preset values instead of just ShipToCode as above.
I tried putting an EXIST subquery after FROM too but that didn't work either.
Is this possible? I'm probably missing something very obvious.
Many thanks!

Answer 1

You can use an ELSE in your CASE expression to combine the two "columns":
CASE
WHEN T4.[U_DestType] = '6'
THEN (SELECT
'Company Limited' AS [ShipToCode]
)
ELSE T2.[ShipToCode]
END AS [ShipToCode],
And by the way, you didn't need to use a Sub-Select. This would work just as well and is easier to read:
CASE
WHEN T4.[U_DestType] = '6' THEN 'Company Limited'
ELSE T2.[ShipToCode]
END AS [ShipToCode],