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Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
What is the result of executing a CROSS JOIN in SQL?
The Correct Answer is: B. It produces a Cartesian product of the two tables.
A CROSS JOIN in SQL combines every row from the first table with every row from the second table, resulting in a Cartesian product. This means if the first table has m rows and the second table has n rows, the result set will contain m × n rows. The CROSS JOIN does not require any matching condition between the tables; it simply pairs each row from the first table with every row from the second table.
Why the other options are incorrect:
A. It returns rows that have matching values in both tables.
This describes an INNER JOIN, where rows are combined only if there is a match in both tables based on a specified condition.
C. It combines all rows from the left table with the matched rows from the right table.
This describes a LEFT JOIN (or LEFT OUTER JOIN), which returns all rows from the left table and matching rows from the right table, filling with NULLs where there is no match.
D. It returns all rows from both tables, filling in NULLs for missing matches.
This is the behavior of a FULL OUTER JOIN, which returns all rows from both tables and fills in NULLs when there is no matching row in the other table.
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