What is the primary key, candidate keys, foreign keys, and non-key columns in these two tables? In which normal form is the logical design of the purchases database?

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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.