The Best Oracle 1Z1-047 exam practice questions and answers

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Exam Code: 1Z1-047
Exam Name: Oracle (Oracle Database SQL Expert)

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NO.1 Evaluate the following CREATE SEQUENCE statement:
What is displayed by the SELECT statement?
A. 1
B. 10
C. 100
D. an error
Answer: A

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NO.2 View the Exhibit and examine the structure of the EMPLOYEES table.
Which statement is true regarding the output for this command?
A. It would return a hierarchical output starting with the employee whose EMPLOYEE_ID is 101, followed
by his or her peers.
B. It would return a hierarchical output starting with the employee whose EMPLOYEE_ID is 101, followed
by the employee to whom he or she reports.
C. It would return a hierarchical output starting with the employee whose EMPLOYEE_ID is 101,
followed by employees below him or her in the hierarchy.
D. It would return a hierarchical output starting with the employee whose EMPLOYEE_ID is101, followed
by employees up to one level below him or her in the hierarchy.
Answer: C

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NO.3 View the Exhibit and examine the data in ORDERS and ORDER_ITEMS tables.
You need to create a view that displays the ORDER ID, ORDER_DATE, and the total number of items in
each order.
Which CREATE VIEW statement would create the view successfully?
A. CREATE OR REPLACE VIEW ord_vu (order_id,order_date)
AS SELECT o.order_id, o.order_date, COUNT(i.line_item_id)
"NO OF ITEMS"
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
GROUP BY o.order_id,o.order_date;
B. CREATE OR REPLACE VIEW ord_vu
AS SELECT o.order_id, o.order_date, COUNT(i.line_item_id)
"NO OF ITEMS"
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
GROUP BY o.order_id,o.order_date;
C. CREATE OR REPLACE VIEW ord_vu
AS SELECT o.order_id, o.order_date, COUNT(i.line_item_id)
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
GROUP BY o.order_id,o.order_date;
D. CREATE OR REPLACE VIEW ord_vu
AS SELECT o.order_id, o.order_date, COUNT(i.line_item_id)||' NO OF ITEMS'
FROM orders o JOIN order_items i
ON (o.order_id = i.order_id)
GROUP BY o.order_id,o.order_date
WITH CHECK OPTION;
Answer: B

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NO.4 Evaluate the following command:
Which statements are true regarding the above view? (Choose all that apply.)
A. It allows you to insert details of all new staff into the EMPLOYEES table.
B. It allows you to delete the details of the existing sales staff from the EMPLOYEES table.
C. It allows you to update the job ids of the existing sales staff to any other job id in the EMPLOYEES
table.
D. It allows you to insert the IDs, last names and job ids of the sales staff from the view if it is used in
multitable INSERT statements.
Answer: BD

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NO.5 View the Exhibit and examine the description of the DEPARTMENTS and EMPLOYEES tables.
To retrieve data for all the employees for their EMPLOYEE_ID, FIRST_NAME, and DEPARTMENT NAME,
the following SQL statement was written:
The desired output is not obtained after executing the above SQL statement. What could be the reason
for this?
A. The NATURAL JOIN clause is missing the USING clause.
B. The table prefix is missing for the column names in the SELECT clause.
C. The DEPARTMENTS table is not used before the EMPLOYEES table in the FROM clause.
D. The EMPLOYEES and DEPARTMENTS tables have more than one column with the same column
name and data type.
Answer: D

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NO.6 Evaluate the following SQL statement:
What would you do to execute the query successfully?
A. Enclose the character literal string in the SELECT clause within the double quotation marks.
B. Do not enclose the character literal string in the SELECT clause within the single quotation marks.
C. Use Quote (q) operator and delimiter to allow the use of single quotation mark in the literal character
string.
D. Use escape character to negate the single quotation mark inside the literal character string in the
SELECT clause.
Answer: C

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NO.7 View the Exhibit and examine the structure of ORD and ORD_ITEMS tables.
In the ORD table, the PRIMARY KEY is ORD_NO and in the ORD_ITEMS tables the composite
PRIMARY KEY is (ORD_NO, ITEM_NO).
Which two CREATE INDEX statements are valid? (Choose two.)
A. CREATE INDEX ord_idx
ON ord(ord_no);
B. CREATE INDEX ord_idx
ON ord_items(ord_no);
C. CREATE INDEX ord_idx
ON ord_items(item_no);
D. CREATE INDEX ord_idx
ON ord,ord_items(ord_no, ord_date,qty);
Answer: BC

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NO.8 View the Exhibit and examine the description of the EMPLOYEES table.
Your company decided to give a monthly bonus of $50 to all the employees who have completed five
years in the company. The following statement is written to display the LAST_NAME, DEPARTMENT_ID,
and the total annual salary:
When you execute the statement, the "Annual Compensation" is not computed correctly. What changes
would you make to the query to calculate the annual compensation correctly?
A. Change the SELECT clause to SELECT last_name, department_id, salary*12+50 "Annual
Compensation".
B. Change the SELECT clause to SELECT last_name, department_id, salary+(50*12) "Annual
Compensation".
C. Change the SELECT clause to SELECT last_name, department_id, (salary+50)*12 "Annual
Compensation".
D. Change the SELECT clause to SELECT last_name, department_id, (salary*12)+50 "Annual
Compensation".
Answer: C

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NO.9 View the Exhibit button and examine the structures of ORDERS and ORDER_ITEMS tables.
In the ORDERS table, ORDER_ID is the PRIMARY KEY and in the ORDER_ITEMS table, ORDER_ID
and LINE_ITEM_ID form the composite primary key.
Which view can have all the DML operations performed on it?
A. CREATE VIEW V1
AS SELECT order_id, product_id
FROM order_items;
B. CREATE VIEW V4(or_no, or_date, cust_id)
AS SELECT order_id, order_date, customer_id
FROM orders
WHERE order_date < '30-mar-2007'
WITH CHECK OPTION;
C. CREATE VIEW V3
AS SELECT o.order_id, o.customer_id, i.product_id
FROM orders o, order_items i
WHERE o.order_id=i.order_id;
D. CREATE VIEW V2
AS SELECT order_id, line_item_id, unit_price*quantity total
FROM order_items;
Answer: B

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NO.10 Which three statements are true regarding single-row functions? (Choose three.)
A. They can accept only one argument.
B. They can be nested up to only two levels.
C. They can return multiple values of more than one data type.
D. They can be used in SELECT, WHERE, and ORDER BY clauses.
E. They can modify the data type of the argument that is referenced.
F. They can accept a column name, expression, variable name, or a user-supplied constant as
arguments.
Answer: DEF

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NO.11 Which two statements are true regarding views? (Choose two.)
A. A simple view in which column aliases have been used cannot be updated.
B. A subquery used in a complex view definition cannot contain group functions or joins.
C. Rows cannot be deleted through a view if the view definition contains the DISTINCT keyword.
D. Rows added through a view are deleted from the table automatically when the view is dropped.
E. The OR REPLACE option is used to change the definition of an existing view without dropping and
re-creating it.
F. The WITH CHECK OPTION constraint can be used in a view definition to restrict the columns displayed
through the view.
Answer: CE

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NO.12 Which two statements are true about sequences created in a single instance database? (Choose
two.)
A. The numbers generated by a sequence can be used only for one table.
B. DELETE <sequencename> would remove a sequence from the database.
C. CURRVAL is used to refer to the last sequence number that has been generated.
D. When the MAXVALUE limit for a sequence is reached, you can increase the MAXVALUE limit by using
the ALTER SEQUENCE statement.
E. When a database instance shuts down abnormally, the sequence numbers that have been cached but
not used would be available once again when the database instance is restarted.
Answer: CD

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NO.13 View the Exhibit and examine the structure of the ORD table.
What would be the outcome of the above statements?
A. All the statements would execute successfully and the ORD_NO column would contain the value 2 for
the CUST_ID 101.
B. The CREATE SEQUENCE command would not execute because the minimum value and maximum
value for the sequence have not been specified.
C. The CREATE SEQUENCE command would not execute because the starting value of the sequence
and the increment value have not been specified.
D. All the statements would execute successfully and the ORD_NO column would have the value 20 for
the CUST_ID 101 because the default CACHE value is 20.
Answer: A

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NO.14 Evaluate the CREATE TABLE statement:
Which statement is true regarding the PROD_ID_PK constraint?
A. It would be created only if a unique index is manually created first.
B. It would be created and would use an automatically created unique index.
C. It would be created and would use an automatically created nonunique index.
D. It would be created and remains in a disabled state because no index is specified in the command.
Answer: B

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NO.15 Which statements are correct regarding indexes? (Choose all that apply.)
A. When a table is dropped, the corresponding indexes are automatically dropped.
B. For each DML operation performed, the corresponding indexes are automatically updated.
C. Indexes should be created on columns that are frequently referenced as part of an expression.
D. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique
index.
Answer: ABD

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NO.16 Which two statements are true regarding operators used with subqueries? (Choose two.)
A. The NOT IN operator is equivalent to IS NULL.
B. The <ANY operator means less than the maximum.
C. =ANY and =ALL operators have the same functionality.
D. The IN operator cannot be used in single-row subqueries.
E. The NOT operator can be used with IN, ANY and ALL operators.
Answer: BE

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NO.17 Which statements are true? (Choose all that apply.)
A. The data dictionary is created and maintained by the database administrator.
B. The data dictionary views can consist of joins of dictionary base tables and user-defined tables.
C. The usernames of all the users including the database administrators are stored in the data dictionary.
D. The USER_CONS_COLUMNS view should be queried to find the names of the columns to which a
constraint applies.
E. Both USER_OBJECTS and CAT views provide the same information about all the objects that are
owned by the user.
F. Views with the same name but different prefixes, such as DBA, ALL and USER, use the same base
tables from the data dictionary
Answer: CDF

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NO.18 View the Exhibit and examine the description of the EMPLOYEES table.
Your company wants to give 5% bonus to all the employees on their annual salary. The SALARY column
stores the monthly salary for an employee. To check the total for annual salary and bonus amount for
each employee, you issued the following SQL statement:
Which statement is true regarding the above query?
A. It would execute and give you the desired output.
B. It would not execute because the AS keyword is missing between the column name and the alias.
C. It would not execute because double quotation marks are used instead of single quotation marks for
assigning alias for the third column.
D. It would execute but the result for the third column would be inaccurate because the parentheses for
overriding the precedence of the operator are missing.
Answer: A

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NO.19 View the Exhibit and examine the structure of the MARKS_DETAILS and MARKStables.
Which is the best method to load data from the MARKS_DETAILStable to the MARKStable?
A. Pivoting INSERT
B. Unconditional INSERT
C. Conditional ALL INSERT
D. Conditional FIRST INSERT
Answer: A

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NO.20 Given below is a list of datetime data types and examples of values stored in them in a random order:
Identify the option that correctly matches the data types with the values.
A. 1-d, 2-c, 3-a, 4-b
B. 1-b, 2-a, 3-c, 4-d
C. 1-b, 2-a, 3-d, 4-c
D. 1-d, 2-c, 3-b, 4-a
Answer: A

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