How to Update in MySQL

To update all rows in a MySQL table, just use the UPDATE statement without a WHERE clause:

UPDATE products SET stocks=100;

You can also update multiple columns at a time:

UPDATE products SET stocks=100, available=true;

Usually you only want to update rows that match a certain condition. You do this by specifying a WHERE clause:

--This will update only one row that matches product_id=1
UPDATE products SET stocks=100, available=true
WHERE product_id=1;

--This will update multiple rows that match Category='Electronics'
UPDATE products SET stocks=50, available=true
WHERE category='Electronics';