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Oracle Database 10g: SQL Fundamentals I
Oracle Training View information about job executions and job instances
Which three statements about subqueries are true? (Choose three)
A. A single row subquery can retrieve only one column and one row.
B. A single row subquery can retrieve only one row but many columns.
C. A multiple row subquery can retrieve multiple rows and multiple columns.
D. A multiple row subquery can be compared by using the ">" operator.
E. A single row subquery can use the IN operator.
F. A multiple row subquery can use the "=" operator.
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Answer: B, C, D
Explanation:
A single row sub-query can retrieve only one row but many columns. A multiple row sub-query can retrieve
one row or multiple rows and multiple columns. A multiple row sub-query can be compared by using the ">"
operator.
Incorrect Answers
A: A single row sub-query can retrieve only one row, but many columns..
E: A single row sub-query cannot use the IN operator.
F: A multiple row sub-query cannot use the "=" operator.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 150-165
Chapter 4: Subqueries