need select statement

how do I modify this sql select statement to include some if/then logic:
SELECT DISTINCT EMAIL FROM  tblBLAH WHERE division_name=@division_name and mgr_email=@mgr_email

I want to add to this that if @division_name is 'unknown' then we need the filter to be where division_name is null...
acdagirlAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
SELECT DISTINCT EMAIL
FROM  tblBLAH
WHERE ( division_name=@division_name OR @division_name =  'unknown'  )
AND mgr_email=@mgr_email
0
Guy Hengel [angelIII / a3]Billing EngineerCommented:
sorry, a small correction:

SELECT DISTINCT EMAIL
FROM  tblBLAH
WHERE (   ( division_name=@division_name AND @division_name <> 'unknown'  )
       OR (division_name IS NULL AND @division_name = 'unknown'  )
      )
AND mgr_email=@mgr_email
0

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acdagirlAuthor Commented:
no, that's not what I want. it's *if* the parameter @division_name comes in as 'unknown' then select division_name is null
0
acdagirlAuthor Commented:
ok, I'll try the second one
0
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Microsoft SQL Server 2005

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