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case syntax during record selection

Posted By:      Posted Date: October 28, 2010    Points: 0   Category :Sql Server

Can someone show me the correct syntax using the CASE statement using this criteria.

When Mcode is equal to 'abdc',rrwe','prqv'
  and  amtpaid <> 0
  and convrate <> 0 or blank or null  THEN

 End as 'PaidAmt'


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Please can anybody this answer.It is urgent

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