The value of the candidate key cannot uniquely identify each tuple in a relation. (a) True (b)False

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Q: A foreign key can refer to only the candidate key of another relation. (a) True (b)False

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A: The error you are encountering is due to trying to add a string (direction) to an integer…

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Q: minimum cost problem

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A: Answer is explained below in detail

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SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.