Question

I have a problem by counting by row in my database.
I have a table with 2 columns: 2011 with its values and 2012 with its values and total column:
table Books:

 2011 2012  TOTAL
   1    2     ?
   6    9     ?
   4   10     ?
  56   12     ?

how can I sum(1+2), sum (6+9) and write the results in the “TOTAL”-column for each row?

Answer 1

This should be pretty straightforward, do not use SUM()

SELECT year1, year2, (year1 + year2) AS Total
FROM   tableName

UPDATE

UPDATE tableName
SET    Total = (year1 + year2)