A key within the Relational database is used for specifying the uniqueness, According to Codd, Date, and all other experts, a key has only one meaning in relational theory: it is a set of one or more columns whose combined values are unique among all occurrences in a given table, some of the most used keys withing the Rrelational Database are defined below.
keys are defined in tables to access or sequence the stored data quickly and smoothly. They are also used to create links between different tables
1. Primary Key
3. Foreign Key
5. Super Key
8. Unique Key
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