Informatics Practices

Are UNION and UNION ALL the same ? Why ?

SQL Joins & Grouping

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Answer

No, UNION and UNION ALL are not same. UNION ALL will retain all the duplicate rows from tables in the final output while UNION will remove the duplicate rows from the final output.

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Informatics Practices

Are UNION and UNION ALL the same ? Why ?

SQL Joins & Grouping

Answer

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