Modifying a column in a table

Question

I have the following table test

iD Name    ParentId   GroupID
-----------------------------
1            1        Null
2            1        Null
3         


        

Answer 1

UPDATE test SET GroupID = 1 WHERE ParentId = 1
UPDATE test SET GroupID = 2 WHERE ParentId = 7
UPDATE test SET GroupID = 3 WHERE ParentId = 9