Calculating the sum of two columns in one table

[dealwi8me]

I have this statement that doesn't work...

UPDATE table1 SET table1.val1 = [table2].[val2]+[table2].[val3];

How can i add two columns of the same table and update my query?

Thank you in advance!

 

[FoFa]

This works for me:
UPDATE Table1 INNER JOIN Table2 ON Table1.TstID=Table2.TstID SET Table1.TestCol2 = Table2.TestCol2+Table2.TestCol3;