Example must show relationship between two databases, where and why primary as well as candidate key is used?
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In a relational database a unique key or which is also known as a primary key is considered as a candidate key that is used for the identification of the row in each row and table. A unique key includes a single column or set of columns. There is only one primary keep but there can be many unique keys. However, the candidate key has to be unique within its domain; it does not hold null values and this key should never change.The example is very lengthy and can be accessed from given link: Example
answered 5 months ago
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