Adding criteria to sum case statement

Using SQL Server, I am simply trying to add criteria for the second line, so the report counts the number of instances where caseType = 'WC' and openDate <= '2015-04-25'. I am struggling with adding the later criteria, it keeps throwing an error.

select caseType,
sum(case caseType when 'WC' then 1 else 0 end) 'Cases prior to Commercial'
sum(case caseType when 'WCP' then 1 else 0 end) 'Leads'
from cases
group by caseType

This code works. Again, I just need to add the date part outlined on my above explanation.

Thanks so much,
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Brian CroweDatabase AdministratorCommented:
select caseType,
      sum(case when caseType = 'WC' AND openDate <= '20150425' then 1 else 0 end) AS [Cases prior to Commercial],
      sum(case caseType when 'WCP' then 1 else 0 end) AS Leads
from cases
group by caseType

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Jabal_AwliyaAuthor Commented:
Your solution seems so right and logical but its throwing an error:

Incorrect syntax near the keyword 'and'.
Jabal_AwliyaAuthor Commented:
nevermind. It works!
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Microsoft SQL Server

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