T-SQL: Using a CASE in an UPDATE statement to update certain columns depending on a condition

Question

I am wondering if this is possible at all. I want to update column x if a condition is true, otherwise column y would be updated

UPDATE table SET
     (CASE          


        

Answer 1

I want to change or update my ContactNo to 8018070999 where there is 8018070777 using Case statement

update [Contacts] set contactNo=(case 
when contactNo=8018070777 then 8018070999
else
contactNo
end)