php - Update database table where value = 0 -

I do not know why I'm being stumped on such a small thing,

but I want to Only update a part of the data in my database

I want to update the table result and want to change all the values ​​in the 'test1' column, where the value is currently 0 and tap it

"post-text" itemprop = "text"

"> update result set test1 = null where test1 = 0