Copy values from one column to another in the same table

Question

How can I make a copy values from one column to another? I have:

Database name: list
number | test
123456 | somedata
123486 | somedata1
232344 | 34


        

Answer 1

BEWARE : Order of update columns is critical

GOOD: What I want saves existing Value of Status to PrevStatus

UPDATE Collections SET  PrevStatus=Status, Status=44 WHERE ID=1487496;

BAD: Status & PrevStatus both end up as 44

UPDATE Collections SET  Status=44, PrevStatus=Status WHERE ID=1487496;