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When you code a union that combines two result sets, which of the following is not true? a . The result sets may or may
When you code a union that combines two result sets, which of the following is not true?
aThe result sets may or may not have any duplicate rows.
bThe corresponding columns in the result sets must have compatible data types.
cThe result sets must be derived from different tables.
dEach result set must have the same number of columns.
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