How to optimize an update SQL that runs on a Oracle table with 700M rows

Question

UPDATE [TABLE] SET [FIELD]=0 WHERE [FIELD] IS NULL

[TABLE] is an Oracle database table with more than 700 million rows. I cancelled the SQL execution a

Answer 1

Vincent already answered your question perfectly, but I'm curious about the "why" behind this action. Why are you updating all NULL's to 0?

Regards, Rob.