MySQL Primary Key: CREATE and ALTER TABLE Statements - Devart Blog
MySQL Add Column to MySQL Database Tables via the Alter Table Command
MariaDB alter table | How to alter table in MariaDB | Examples
Using MySQL Unique Constraints
MariaDB Foreign Key Constraints
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
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