Informatics Practices
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.
SQL Joins & Grouping
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Answer
A is false but R is true.
Explanation
The cartesian product does not require any identical columns, it pairs each row from one table with every row from another table, creating all possible combinations of rows and returning them.
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Related Questions
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.
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. The join in which columns are compared for equality, is called an Equi-join.
Reason. The join condition can only compare columns with equal sign.
- 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. The join, in which columns are compared for equality, is called an Equi-join.
Reason. In non-equi joins, the columns are compared with non-equality conditional operators.
- 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.