जॉइन Examsbookउत्तर :
Difference between Union and Union all?5
प्र: Difference between Union and Union all?
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उत्तर :
व्याख्या :
The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all rows from all tables fitting your query specifics and combines them into a table. A UNION statement effectively does a SELECT DISTINCT on the results set.

