Oracle updating a multiset collection
The final combined result set contains value from all the SQLs. SELECT TO_DATE('12-OCT-03') FROM DUAL UNION SELECT '13-OCT-03' FROM DUAL; SELECT TO_DATE('12-OCT-03') FROM DUAL * ERROR at line 1: ORA-01790: expression must have same datatype as corresponding expression UNION and UNION ALL are similar in their functioning with a slight difference.
But UNION ALL gives the result set without removing duplication and sorting the data.
For example,the below SELECT query retrieves the salary which are common in department 10 and 20.
As per ISO SQL Standards, INTERSECT is above others in precedence of evaluation of set operators but this is not still incorporated by Oracle.
If you don't want someone like me, please let your freak flag fly right away.
Set operators are used to join the results of two (or more) SELECT statements.
Essentially,it removes duplicates from the results i.e.
The UNION set operator returns the combined results of the two SELECT statements.
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