Multiple choice technology databases

When is a Cartesian product formed?

  1. When a join condition is omitted.

  2. When a join condition is invalid.

  3. All rows in the first table are joined to all rows in the second table.

  4. All of the above.
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D Correct answer
Explanation

A Cartesian product (or cross join) occurs when: (1) no join condition is specified, (2) the join condition is invalid, or (3) when all rows from one table are joined to all rows from another. All three scenarios lead to every row in the first table being combined with every row in the second table.

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