How to set a column x with the value x+y in Oracle?

I wanted the exact syntax for the following operation

UPDATE table1
SET colx= colx+y
WHERE ..some condtion..

Note: c开发者_C百科olx and y are of the type NUMBERs

Thanks, Amrutha

Your syntax is already correct. For example:

update emp
set    sal = sal + 1000
where  empno = 1234;