Introduction To Data Base Design | Primary Keys | Part 4 | Eduonix
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Introduction To Data Base Design | Primary Keys | Part 4 | Eduonix
So, primary keys in Database!! A primary key is a very special relational database table column (or combination of columns) designated to uniquely identify all table records. It has 3 main features which are: They must contain a unique value for each row of data, it shouldn't contain null values and it should be either an existing table column ...
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Primary key ...
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