With the UNION clause, each query involved must output the same number of columns, and they must be UNION compatible.
Answer: A
No answer description available for this question.
A function returns one value and has only output parameters.
Answer: B
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A correlated subquery is where the outer query depends on data from the inner query.
Answer: B
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Outer join is the same as equi-join, except one of the duplicate columns is eliminated in the result table.
Answer: B
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The most frequently used relational operation, which brings together data from two or more related tables into one resultant table, is called an equi-join.
Answer: B
No answer description available for this question.