May 1, 2013
In MySQL, what are the differences between primary, foreign, and unique keys?
In MySQL, what are the differences between primary, foreign, and unique keys?
The one thing that primary, unique, and foreign keys all have in common is the fact that each type of key can consist of more than just one column from a given table. In other words, foreign, primary, and unique keys are not restricted to having just one…
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