Using Max(boolean) in a case statement - sql

Question

I am made a temp table of accounts in a database with booleans that provide insight about the accounts. Some customers have multiple accounts so I am grouping them together and was trying to look at the MAX(Boolean) to set a status field.
My query kinda looks like:
with t as (Select lngCustomerNumber,
Case
When 'Criteria for being Active' Then 1
End as blnActive,
Case
When 'Criteria for unexpired' Then 1
End as blnUnexpired
From AccountTable)
Select t.CustomerNumber,
Case
When Max(t.blnActive) = 1
AND Max(t.blnUnexpired) = 1 Then 'Active/Unexpired'
When Max(t.blnActive) = 1
AND Max(t.blnUnexpired) = 0 Then 'Active/Expired'
When Max(t.blnActive) = 0
AND Max(t.blnUnexpired) = 1 Then 'Inactive/Unexpired'
When Max(t.blnActive) = 0
AND Max(t.blnUnexpired) = 0 Then 'Inactive/Expired'
End As strLicenseStatus
From T
Group By t.CustomerNumber
Anything where it checks if the Max(Boolean) = 1 will calc to True correctly, but if I do Max(Boolean) = 0 or Max(Boolean) <> 1 then it does not calc to True when it should.
I have tested by just looking at the grouped Temp Table with each boolean bringing back its Max() value and the ones that should be 0 are coming back as 0.
As a workaround, I have tried
Where t.CustomerNumber NOT IN (SELECT t2.CustomerNumber
FROM t t2
WHERE t2.blnUnexpired = 1
AND t2.CustomerNumber = t.CustomerNumber )
And that does give me the results that I am looking for but I have millions of rows coming back so it has been timing out after many hours, where the previous method was able to run in less than an hour.
I have some other data in my query, the one presented is a much smaller version used to highlight my issue.
Any recommendations on how I can make this work?
Thank you.

Answer 1

When you are defining your blnActive and blnUnexpired cases, you only have the "1" case defined, which means if it doesn't meet these criteria, it will be null. Try adding else 0 to each case:
with t as (Select lngCustomerNumber,
Case
When 'Criteria for being Active' Then 1
Else 0
End as blnActive,
Case
When 'Criteria for unexpired' Then 1
Else 0
End as blnUnexpired
From AccountTable)