What Is Candidate Key SQL? [Primary Key vs Candidate Key]

 SQL Keys are defined as a set of attributes that are generally needed to access tuples from a table. These two SQL keys are a vital part of SQL keywords and are also used to construct relationships between the two tables. In this blog, we will discuss SQL Primary keys, what is a candidate key SQL and significant differences between the two.  Both SQL keys are responsible for identifying a tuple within a table or a relation. The major difference is that there can be only one primary key that can be defined for a table. However, candidate keys can be used multiple times in a database relation. 



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