Efficient way to update all rows in a table

Question

I have a table with a lot of records (could be more than 500 000 or 1 000 000). I added a new column in this table and I need to fill a value for every row in the column, us

Answer 1

The usual way is to use UPDATE:

UPDATE mytable
   SET new_column = 

You should be able to do this is a single transaction.