Here is my query for Microsoft SQL Server:
select count(distinct AEN) as Customers
from
( select top 100 ERDAT, AEN,
case
when AEN = 'MBLE' AND ERDAT between '20220401' and '20220430' then 'Mobile'
when AEN = 'ISU' AND ERDAT between '20220401' and '20220430' then 'Website'
when AEN = 'CRM' AND ERDAT between '20220401' and '20220430' then 'CRM'
when AEN like '_[0-9]%' AND ERDAT between '20220401' and '20220430' then 'ID Number'
else 'Others'
end as 'Channels'
from [Table]
)
Apparently there is issues with the brackets. Any help is much appreciated! :)
As already mentioned in the comments, you need an alias for your subquery.
change this
count(distinct AEN) as Customers
into this
count(distinct t.AEN) as Customers
and also this
[table]
)
into this
[table]
) t
look at this DBFiddle
This will run without the error, but I have no clue if this is what you want to achieve, your question is not any clear about that
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