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Download Oracle Database SQL Exam Dumps
NEW QUESTION 38
Evaluate the following two queries:
Which statement is true regarding the above two queries?
- A. Performance would degrade in query 2.
- B. Performance would improve in query 2.
- C. Performance would improve in query 2 only if there are null values in the CUST_CREDIT_LIMIT column.
- D. There would be no change in performance.
Answer: D
NEW QUESTION 39
Examine the command:
What does ON DELETE CASCADE imply?
- A. When the BOOKS table is dropped, the BOOK_TRANSACTIONS table is dropped.
- B. When a row in the BOOKS table is deleted, the rows in the BOOK_TRANSACTIONS table whose BOOK_ID matches that of the deleted row in the BOOKS table are also deleted.
- C. When a value in the BOOKS.BOOK_ID column is deleted, the corresponding value is updated in the BOOKS_TRANSACTIONS.BOOK_ID column.
- D. When the BOOKS table is dropped, all the rows in the BOOK_TRANSACTIONS table are deleted but the table structure is retained.
Answer: B
NEW QUESTION 40
Which three statements are true regarding subqueries? (Choose three.)
- A. Subqueries can contain ORDER BY but not the GROUP BY clause.
- B. Subqueries can contain GROUP BY and ORDER BY clauses.
- C. Main query and subquery must get data from the same tables.
- D. Only one column or expression can be compared between the main query and subquery.
- E. Main query and subquery can get data from different tables.
- F. Multiple columns or expressions can be compared between the main query and subquery.
Answer: B,E,F
Explanation:
Explanation
References:
http://docs.oracle.com/javadb/10.6.2.1/ref/rrefsqlj13658.html
NEW QUESTION 41
View the Exhibit and examine the structure of the SALESand PRODUCTStables. (Choose two.)
In the SALEStable, PROD_ID is the foreign key referencing PROD_ID in the PRODUCTS table. You must list each product ID and the number of times it has been sold.
Examine this query which is missing a JOINoperator:
Which two JOINoperations can be used to obtain the required output? (Choose two.)
- A. LEFT OUTER JOIN
- B. JOIN
- C. FULL OUTER JOIN
- D. RIGHT OUTER JOIN
Answer: A,C
NEW QUESTION 42
Examine the description of the CUSTOMERStable:
You need to display last names and credit limits of all customers whose last name starts with A or B in lower or upper case, and whose credit limit is below 1000.
Examine this partial query:
Which two WHEREconditions give the required result? (Choose two.)
- A.
- B.
- C.
- D.
- E.
Answer: A,D
NEW QUESTION 43
……
