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INTERSECT and MINUS set operations produce unduplicated results.All the SET operators share the same degree of precedence among them.Essentially,it removes duplicates from the results i.e.only one row will be listed for each duplicated result.For number columns, zero can also be substituted to match the type of the columns selected in the query.In the below query, the data type of employee name (varchar2) and location id (number) do not match.
Set operators are used to join the results of two (or more) SELECT statements.For example,in above query UNION is replaced by UNION ALL to see the effect. Note the difference in the output which is generated without sorting and deduplication.Using INTERSECT operator, Oracle displays the common rows from both the SELECT statements, with no duplicates and data arranged in sorted order (ascending by default).Instead,during query execution, Oracle starts evaluation from left to right or from top to bottom.If explicitly parentheses are used, then the order may differ as parentheses would be given priority over dangling operators.
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