Delete in SQL

Hi! I just learned how to delete columns that the value is NULL. I was so sad to delete all the columns. I’d like to know if there’s an ‘undo’. Like go back. Undelete. Thank you guys so much!

You could look at these two links for ideas, best practice is just to to back up regularly (I know that doesn’t help right now :frowning: .

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Thanks. :neutral_face: :wink: