Select the correct answerWhat is the purpose of the SQL UNION operator?OptionsCombines rows from two or more tables, removing duplicatesCombines rows from two or more tables, including duplicatesSorts rows in a tableDeletes rows from a table
Question
Select the correct answerWhat is the purpose of the SQL UNION operator?OptionsCombines rows from two or more tables, removing duplicatesCombines rows from two or more tables, including duplicatesSorts rows in a tableDeletes rows from a table
Solution
The correct answer is "Combines rows from two or more tables, removing duplicates". The SQL UNION operator is used to combine the result sets of 2 or more SELECT statements, but it removes duplicate rows. Each SELECT statement within the UNION must have the same number of columns with similar data types. The columns in each SELECT statement must also be in the same order.
Similar Questions
What does the UNION operation automatically eliminate in SQL?
What does the UNION operation automatically eliminate in SQL?Null values.Duplicate tuples.Relations with different schemas.Operations on virtual relations.
What is the purpose of the SQL UNION operator?
What does the SQL JOIN clause do?OptionsSorts rows in a tableDeletes rows from a tableCombines rows from two or more tablesInserts rows into a table
What does the SQL SELECT DISTINCT statement do?OptionsDeletes duplicate rows from a tableUpdates distinct values in a tableInserts distinct rows into a tableRetrieves unique values from a column
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