Oracle
1Z0-047 · Question #117
Which two statements are true regarding subqueries? (Choose two.)
The correct answer is B. A subquery can be used to access data from one or more tables or views. C. If the subquery returns 0 rows, then the value returned by the subquery expression is NULL. See the full explanation below for the reasoning.
Question
Which two statements are true regarding subqueries? (Choose two.)
Options
- AOnly two subqueries can be placed at one level.
- BA subquery can be used to access data from one or more tables or views.
- CIf the subquery returns 0 rows, then the value returned by the subquery expression is NULL.
- DThe columns in a subquery must always be qualified with the name or alias of the table used.
- EA subquery in the WHERE clause of a SELECT statement can be nested up to three levels only.
How the community answered
(33 responses)- A3% (1)
- B76% (25)
- D12% (4)
- E9% (3)
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