What does the UNION operation automatically eliminate in SQL?Null values.Duplicate tuples.Relations with different schemas.Operations on virtual relations.
Question
What does the UNION operation automatically eliminate in SQL?Null values.Duplicate tuples.Relations with different schemas.Operations on virtual relations.
Solution
The UNION operation in SQL automatically eliminates duplicate tuples. This means that if there are two or more identical rows in the result set of the UNION operation, only one of them will be included in the final result set.
Similar Questions
What does the UNION operation automatically eliminate in SQL?
What is the purpose of the SQL UNION operator?OptionsCombines rows from two or more tables, including duplicatesCombines rows from two or more tables, removing duplicatesSorts rows in a tableDeletes rows from a table
What is the purpose of the SQL UNION operator?
A UNION query is which of the following?Combines the output from multiple queries and must include the same number of columns.Combines the output from no more than two queries and must include the same number of columns.Combines the output from multiple queries and does not include the same number of columns.Combines the output from no more than two queries and does not include the same number of columns.
In which scenario would using UNION ALL be preferable over UNION in SQL?Question 16Answera.When you want to filter out NULL values from the result setb.When you want to sort the combined result set based on a specific columnc.When you want to eliminate duplicate rows from the combined result setd.When you want to merge result sets while preserving duplicate rows
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