Update row with data from another row in the same table

Question

I\'ve got a table which looks something like this

ID   |   NAME    |  VALUE  |
----------------------------
 1   |   Test    |  VALUE1 |
 2   |   Test2   |          


        

Answer 1

UPDATE financialyear
   SET firstsemfrom = dt2.firstsemfrom,
       firstsemto = dt2.firstsemto,
       secondsemfrom = dt2.secondsemfrom,
       secondsemto = dt2.secondsemto
  from financialyear dt2
 WHERE financialyear.financialyearkey = 141
   AND dt2.financialyearkey = 140