Update query using Subquery in Sql Server

Question

I have a simple table Structure like this:

Table tempData

╔══════════╦═══════╗
║   NAME   ║ MARKS ║
╠══════════╬═══         


        

Answer 1

Here in my sample I find out the solution of this, because I had the same problem with updates and subquerys:

UPDATE
    A
SET
    A.ValueToChange = B.NewValue
FROM
    (
        Select * From C
    ) B
Where 
    A.Id = B.Id