Informatics Practices
Assertion (A): The INTERSECT operator returns all rows that are in both result sets.
Reasoning (R): The UNION and INTERSECT yields same output.
- 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.
Answer
A is true but R is false.
Explanation
The INTERSECT operator returns all rows that appear in both interconnected tables, while the UNION operator returns all rows from interconnected tables, eliminating duplicate rows. Therefore, the UNION and INTERSECT operators do not yield the same output.
Related Questions
Assertion (A): Aggregate functions in SQL operate on multiple set of values and return a single value as the output.
Reasoning (R): The aggregate functions are used to perform some fundamental arithmetic operations such as MAX(), MIN(), SUM() etc.
- 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 (A): A Join is a query that combines rows from two or more tables.
Reasoning (R): Equi-joins are joins based on equality conditions.
- 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 (A): GROUP BY clause is always preceded by ORDER BY clause in a SELECT statement.
Reasoning (R): ORDER BY clause always follows other clauses.
- 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 (A): All aggregate functions except count(*) ignore null values in their input collection.
Reasoning (R): SUM, AVG, MIN, and MAX can only be used with numeric columns.
- 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.