Informatics Practices
Assertion. Cartesian product and joins are related.
Reason. Cartesian product is a join without any condition.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
SQL Joins & Grouping
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation
The Cartesian product and joins are related because a Cartesian product is a join without any condition. While a join is a query that combines rows from two or more tables based on a specified condition, a Cartesian product (or cross join) pairs every row from one table with every row from another, resulting in a set that includes all possible combinations of rows.
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Related Questions
UNION returns unique rows.
UNION and UNION ALL produce similar results.
Assertion. The cardinality of a cartesian product can be predetermined, unlike joins.
Reason. The cardinality of a cartesian product is cardinality of table 1 x cardinality of table 2.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion. There must be some identical columns in tables in order to get cartesian product.
Reason. The cartesian product returns all possible combinations of rows from the participating tables.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.