With the UNION clause, each query involved must output the same number of columns, and they must be UNION compatible.

A. Equi-join B. Natural join C. Outer join D. All of the above

A. Equi-join B. Natural join C. Outer join D. All of the above

A. You do not create them with SQL. B. They do not need to have a unique name. C. They include procedural and SQL statements. D. They are the same thing as a function.

A. A way to establish an IF-THEN-ELSE in SQL. B. A way to establish a loop in SQL. C. A way to establish a data definition in SQL. D. All of the above.