Which two statements are true regarding subqueries? (Choose two.)
A.
Only two subqueries can be placed at one level.
B.
A subquery in the WHERE clause of a SELECT statement can be nested up to three
levels only.
C.
The columns in a subquery must always be qualified with the name or alias of the table
used.
D.
If the subquery returns 0 rows, then the value returned by the subquery expression is
NULL.
E.
A subquery can be used to access data from one or more tables or views.
Explanation: