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Tobias_Petry.sql on Twitter: "⚡️ Database Tip Sometimes you want to make columns unique but you can't because e.g. there are still soft-deleted rows in the table witht the same value. By only
MySQL Add Primary Key to MySQL Database Tables via the Alter Table Command
❤ 💻 MySQL - add index to existing table - Dirask
MySQL Constraint - w3resource
