if else statment in sybase


I am trying to write an if - else statement where the table Machine has PROD and CPU columns.  I want to write it such that if PROD = 'Y' then insert the number of cpu in CPU column to another temporary table call #CpuCount, then sum up the number.  Can anyone please help me out ?  The table is in Sybase.  Thanks.
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Not sure where the IF would come in?

Assuming #cpuCount already exists and you want to include any data in there in your sum:

insert #cpuCount select CPU from Machine where PROD = 'Y'
select sum(CPU) from #cpuCount

Assuming #cpuCount doesn't exist:

select CPU into #cpuCount from Machine where PROD = 'Y'
select sum(CPU) from #cpuCount

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KaydensunAuthor Commented:
Thank you for you solution.  
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