Why is a CROSS JOIN not so useful? a. It nullifies all primary keys b. It is no longer supported by SQL c. It combines every row in one table with every row in another table. d. It combines all foreign keys into one table called foreign keys.
Why is a CROSS JOIN not so useful? a. It nullifies all primary keys b. It is no longer supported by SQL c. It combines every row in one table with every row in another table. d. It combines all foreign keys into one table called foreign keys.
Chapter9: Joining Data From Multiple Tables
Section: Chapter Questions
Problem 2RQ
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Question
Why is a CROSS JOIN not so useful?
a.
It nullifies all primary keys
b.
It is no longer supported by SQL
c.
It combines every row in one table with every row in another table.
d.
It combines all foreign keys into one table called foreign keys.
Expert Solution
Step 1: Introduction to CROSS JOIN
In the context of databases and SQL (Structured Query Language), a CROSS JOIN is a type of join operation that combines every row from one table with every row from another table. Unlike other types of joins, such as INNER JOIN or OUTER JOIN, a CROSS JOIN does not use any specific join condition to filter or match rows from the two tables. Instead, it generates the Cartesian product of the two tables involved in the join.
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