I am runnning a Postgres and Mysql server and I have table:
id | name | age | old_age
1 abc 20
I want to update column age with 21 with storing old value 20 into old_age column.
I can fetch the row and read the value of age and then update but that will require running 2 queries. 1 select and 1 update. Is there any way we can update in 1 query? I just want to copy age to old_age.