Informatics Practices
UNION and UNION ALL produce similar results.
SQL Joins & Grouping
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Answer
False
Reason — UNION ALL will retain all the duplicate rows from tables in the final output, while UNION will remove the duplicate rows and include only distinct rows in the final output.
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Related Questions
MINUS operator is also called EXCEPT operator.
UNION returns unique rows.
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.