complex Subtract in sql server query

Posted by AmRoSH on Stack Overflow See other posts from Stack Overflow or by AmRoSH
Published on 2010-05-20T16:12:37Z Indexed on 2010/05/20 16:30 UTC
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sql-server

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query

Hello,

I have table like following

PK      num1   num2  numsdiff
1       10     15    ?
2       20     25    ?
3       30     35    ?
4       40     45    ?

i need to get Subtract of 20 - 15 and 30 - 25 and 40 - 35 and so on by select query from this table.

any ideas?.

thanks

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