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Oracle Database SQL Sample Questions (Q121-Q126):

NEW QUESTION # 121
Evaluate the following statement.

Which statement is true regarding the evaluation of rows returned by the subquery in the INSERT statement?

• A. Each row is evaluated by the first WHEN clause and if the condition is false then the row would be evaluated by the subsequent WHEN clauses.
• B. Each row is evaluated by the first WHEN clause and if the condition is true, then the row would be evaluated by the subsequent WHEN clauses.
• C. All rows are evaluated by all the three WHEN clauses.
• D. The INSERT statement will return an error because the ELSE clause is missing.

Answer: C

 

NEW QUESTION # 122
Which two statements will return the names of the three employees with the lowest salaries?

• A. SELECT last_name,salary
  FROM employees
  ORDER BY salary
  FETCH FIRST 3 ROWS ONLY;
• B. SELECT last_name,salary
  FROM (SELECT * FROM employees ORDER BY salary)
• C. SELECT last_name, salary
  FROM employees
  WHERE ROWNUM<=3
• D. SELECT last_name,salary
  FROM employees
  WHERE ROWNUM<=3
  ORDER BY (SELECT salary FROM employees);
• E. SELECT last_name,salary
  FROM employees
  FETCH FIRST 3 ROWS ONLY
  ORDER BY salary;

Answer: A

Explanation:
To retrieve the names of the three employees with the lowest salaries, the correct SQL syntax and logic are crucial:
Option B:
SELECT last_name, salary FROM employees ORDER BY salary FETCH FIRST 3 ROWS ONLY; This query correctly sorts employees by their salary in ascending order and fetches the first three rows only. The FETCH FIRST n ROWS ONLY syntax is a standard way to limit the result set in SQL.
Options A, C, D, and E do not correctly implement the logic for fetching the lowest three salaries due to misuse of ROWNUM or incorrect placement of ORDER BY and FETCH clauses.

 

NEW QUESTION # 123
View the Exhibit and examine the structure of the PRODUCTS table. Which two tasks require subqueries?

• A. Display the total number of products supplied by supplier 102 which have a product status of obsolete.
• B. Display the number of products whose PROD_LIST_PRlCE is more than the average prod_list_price.
• C. Display products whose prod_min_PRICE is more than the average PROD_LIST_PRlCE of all products, and whose status is orderable.
• D. Display the minimum prod_list_price for each product status.
• E. Display suppliers whose PR0D_LIST_PRICE is less than 1000.

Answer: B,C

 

NEW QUESTION # 124
Which three tasks can be performed by DDL statements?

• A. providing an alternative name for a table
• B. preventing data retrieval from a table outside of office hours
• C. creating multiple savepoints to enable partial rollback of a transaction
• D. modifying a table to prevent data that violate certain conditions from being entered in a column
• E. preventing any data modification to a table

Answer: A,D,E

 

NEW QUESTION # 125
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.) FULL OUTER JOIN

• A. RIGHT OUTER JOIN
• B. JOIN
• C.
• D. LEFT OUTER JOIN

Answer: A,B

 

NEW QUESTION # 126
......

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