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Informix Add Primary Key to Informix Database Tables via the Alter Table Command
DB2 Add Primary Key to DB2 Database Tables via the Alter Table Command
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MySQL Add Foreign Key to MySQL Database Tables via the Alter Table Command
SQL PRIMARY KEY: How to Create & Add to Existing Table
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MySQL Primary Key: CREATE and ALTER TABLE Statements - Devart Blog
MySQL alter table add primary key - YouTube
SQL Primary Key Constraint
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Add an AUTO_INCREMENT column as PRIMARY KEY in MySQL table
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SQLite ALTER TABLE & How To Overcome Its Limitations
