Given the following query:SELECT DISTINCT zip, categoryFROM customers NATURAL JOIN orders NATURAL JOIN orderitemsNATURAL JOIN books;Which of the following queries is equivalent? (refer to the tables in the JustLee Books database.)a. SELECT zip FROM customersUNIONSELECT category FROM books;b. SELECT DISTINCT zip, categoryFROM customers c, orders o, orderitems oi, books bWHERE c.customer# ¼ o.customer# AND o.order# ¼ oi.order#AND oi.isbn ¼ b.isbn;c. SELECT DISTINCT zip, categoryFROM customers c JOIN orders oJOIN orderitems oi JOIN books bON c.customer# ¼ o.customer#AND o.order# ¼ oi.order#AND oi.isbn ¼ b.isbn;d. all of the abovee. none of the above

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A: Cartesian Join: The CARTESIAN JOIN is also known as CROSS JOIN. The CARTESIAN JOIN selects the…

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A: Please refer to the following step for the complete solution of the problem above.

Q: Which of the following queries is valid? (refer to the tables in the JustLee Books database.) a.…

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A: ANSWER IS D   NATURAL JOIN

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A: Answer of the above question:

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A: Answer

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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.