Explain UNION, MINUS, UNION ALL and INTERSECT
Answer posted by Scott on 2005-05-25 18:32:51: UNION - the values of the first query are returned with the values of the second query eliminating duplicates.
MINUS - the values of the first query are returned with duplicates values of the second query removed from the first query.
UNION ALL - the values of both queries are returned including all duplicates
INTERSECT - only the duplicate values are returned from both queries.
Editorial / Best Answerrampratap409
UNION: Take the common record once( No Duplicate)
UNION ALL : Takes Duplicates also
Minus: Result of first query - result of second query
select * from emp where rownum<=9;
select * from emp where rownum<9;
this will display 9th row of emp
Intersect: common result of both query
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