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Oracle Database SQL Sample Questions (Q121-Q126):

NEW QUESTION # 121

Which three statements are true?

A. The DEPTNO column in the EMP table can contain the value 1.
B. The DEPTNO column in the EMP table can contain NULLS .
C. The SALARY column must have a value .
D. The COMMISSION column can contain negative values .
E. The MANAGER column is a foreign key referencing the EMPNO column.
F. An index is created automatically in the MANAGER column.
G. The DNAME column has a unique constraint.

Answer: A,B,F

NEW QUESTION # 122
View the Exhibit and examine the description for the SALES and CHANNELS tables. (Choose the best answer.)

You issued this SQL statement:

Which statement is true regarding the result?

A. The statement will fail because the subquery in the VALUES clause is not enclosed within single quotation marks.
B. The statement will execute and a new row will be inserted in the SALES table.
C. The statement will fail because the VALUES clause is not required with the subquery.
D. The statement will fail because a subquery cannot be used in a VALUES clause.

Answer: B

NEW QUESTION # 123
Examine the data in the EMP table:

You execute this query:
SELECT deptno AS "Department", AVG(sal) AS AverageSalary, MAX(sal) AS "Max Salary" FROM emp WHERE sal >= 12000 GROUP BY "Department " ORDER BY AverageSalary; Why does an error occur?

A. An alias name must not be used in a GROUP BY clause.
B. An alias name must not be used in an ORDER BY clause.
C. An alias name must always be specified in quotes.
D. An allas name must not contain space characters.

Answer: A

Explanation:
C . True. The error occurs because the alias "Department" used in the GROUP BY clause is enclosed in double quotes, which makes it case-sensitive. However, the column deptno is not originally created with double quotes in the table definition, so you cannot refer to it with a case-sensitive alias in the GROUP BY clause. Oracle interprets "Department" as a string literal, not a column alias, in the GROUP BY clause.
A is incorrect because you can use an alias in an ORDER BY clause. B is incorrect because an alias can contain space characters if it is quoted. D is incorrect because an alias does not always have to be specified in quotes, only when it includes special characters or spaces or if it is case-sensitive.

NEW QUESTION # 124
View the Exhibit and examine the ORDERS table.
The ORDERS table contains data and all orders have been assigned a customer ID. Which statement would add a NOT NULL constraint to the CUSTOMER_ID column?

A. ALTER TABLE orders
ADD customer_id NUMBER(6)CONSTRAINT orders_cust_id_nn NOT NULL;
B. ALTER TABLE orders
ADD CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);
C. ALTER TABLE orders
MODIFY customer_id CONSTRAINT orders_cust_id_nn NOT NULL;
D. ALTER TABLE orders
MODIFY CONSTRAINT orders_cust_id_nn NOT NULL (customer_id);

Answer: C

NEW QUESTION # 125
Which three statements are true regarding subqueries? (Choose three.)

A. Subqueries can contain GROUP BY and ORDER BY clauses.
B. Subqueries can contain ORDER BY but not the GROUP BY clause.
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: A,E,F

Explanation:
Explanation
References:
http://docs.oracle.com/javadb/10.6.2.1/ref/rrefsqlj13658.html

NEW QUESTION # 126
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