If you're coming across an error "You are using safe update mode" when trying to run a MySQL query without a WHERE statement, this is due to a MySQL safeguard against you accidently overriding every data row in your database - so it's actually a wise setting option to have on for a live environment. If you do actually want to update every row in one go however and this setting is getting in the way, you can use the following command:
SET SQL_SAFE_UPDATES = 0;
This very simply switches off the safety check for your current session.
To permanently switch this feature off in MySQL WorkBench, follow these instructions: