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sql script - sql server 2008

Last Modified: 2012-05-11
Hi. From the below, how can i calculate the total of col 1 + col2 + col4 and put results in new column named 'newcol5'?

Also, calculate the following: 12 mth average based on recent calendar quarter and put results as 'total12avg'? In this case it would be the average of all rows from column 'month' 2010-04 to 2011-03. Thanks.

Month       col 1      col2 2       col3 x      col4        'newcol 5'
2011-05      x                   x            x               x             x      
2011-04      x      
2011-03      x      
.......-....    x
.......-.....      x             x               x               x             x
2010-04   x             x               x               x             x

First quarter: from the beginning of January to the end of March                        
Second quarter: from the beginning of April to the end of June                        
Third quarter: from the beginning of July to the end of September                        
Fourth quarter: from the beginning of October to the end of December      
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