What the difference between UNION and UNIONALL?

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Prashant K · Answer

Both commands combines the tables with common fields except ‘UNION’ displays all the rows from objects without looking at duplicate records whereas ‘UNION ALL’ looks for it and displays only unique records. Thus ‘UNION’ it slower than ‘UNION ALL’

Anonymous User · Answer

Union will remove the duplicate rows from the result set
while Union All doesn’t.

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What the difference between UNION and UNIONALL?

Anonymous User

Can you answer this question?

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