![]() ![]() ![]() If component queries select character data, then the datatype of the return values are determined as follows: ![]() The corresponding expressions in the select lists of the component queries of a compound query must match in number and must be in the same datatype group (such as numeric or character). If a SQL statement contains multiple set operators, then Oracle Database evaluates them from the left to right unless parentheses explicitly specify another order. You can combine multiple queries using the set operators UNION, UNION ALL, INTERSECT, and MINUS. ![]()
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