Aco 6

Front 1

1. The STATE table has the following constraints (the constraint status is shown in parentheses):
Primary key pk_state (enabled)
Foreign key COUNTRY table: fk_state (enabled)
Check constraint ck_cnt_code (disabled)
Check constraint ck_st_code (enabled)
Not null constraint nn_st_name (enabled)

You execute the following SQL:
CREATE TABLE STATE_NEW AS SELECT * FROM STATE;


How many constraints will there be in the new table?
A. 0

B. 1

C. 3

D. 5

E. 2

Back 1

1. B. When you create a table using CTAS (CREATE TABLE AS SELECT), only the NOT NULL constraints are copied.

Front 2

2. Which line of code has an error?
1 CREATE TABLE FRUITS_VEGETABLES
2 (FRUIT_TYPE VARCHAR2,
3 FRUIT_NAME CHAR (20),
4 QUANTITY NUMBER);


A. 1

B. 2

C. 3

D. 4

Back 2

2. B. A VARCHAR2 datatype should always specify the maximum length of the column.

Front 3

3. Which statement successfully adds a new column, ORDER_DATE, to the table ORDERS?
A. ALTER TABLE ORDERS ADD COLUMN ORDER_DATE DATE;

B. ALTER TABLE ORDERS ADD ORDER_DATE (DATE);

C. ALTER TABLE ORDERS ADD ORDER_DATE DATE;]
D. ALTER TABLE ORDERS NEW COLUMN ORDER_DATE TYPE DATE;

Back 3

3. C. The correct statement is C. When adding only one column, the column definition doesn’t need to be enclosed in parentheses.

Front 4

4. What are the special characters allowed in a table name? (Choose all that apply.)
A. &

B. #

C. @

D. $

Back 4

4. B, D. Only three special characters ($, _, and #) are allowed in table names along with letters and numbers.

Front 5

5. Consider the following statement:
CREATE TABLE MY_TABLE (
1ST_COLUMN NUMBER,
2ND_COLUMN VARCHAR2 (20));


Which of the following best describes this statement?
A. Tables cannot be created without a defining a primary key. The table definition here is missing the primary key.

B. The reserved word COLUMN cannot be part of the column name.

C. The column names are invalid.

D. There is no maximum length specified for the first column definition. Y ou must always specify a length for character and numeric
columns.

E. There is no error in the statement.

Back 5

5. C. All identifiers (column names, table names, and so on) must begin with an alphabetic character. An identifier can contain alphabetic
characters, numbers, and the special characters $, #, and _.

Front 6

6. Which dictionary view would you query to list only the tables you own?
A. ALL_TABLES

B. DBA_TABLES

C. USER_TABLES

D. USR_TABLES

Back 6

6. C. The USER_TABLES view provides information on the tables owned by the user who has logged on that session. DBA_TABLES will have all the tables in
the database, and ALL_TABLES will have the tables owned by you as well as the tables to which you have access. USR_TABLES is not a valid dictionary
view.

Front 7

7. The STATE table has six rows. You issue the following command:
ALTER TABLE STATE ADD UPDATE_DT DATE DEFAULT SYSDATE;


Which of the following is correct?
A. A new column, UPDATE_DT, is added to the STATE table, and its contents for the existing rows are NULL.

B. Since the table is not empty, you cannot add a new column.

C. The DEFAULT value cannot be provided if the table has rows.

D. A new column, UPDATE_DT, is added to STATE and is populated with the current system date and time.

Back 7

7. D. When a default value is specified in the new column added, the column values for the existing rows are populated with the default value. I f you
include the NOT NULL constraint with the DEFAULT value, only the dictionary is updated.

Front 8

8. The HIRING table has the following data:
EMPNO HIREDATE
--------- ----------
1021 12-DEC-00
3400 24-JAN-01
2398 30-JUN-01


What will be result of the following query?
SELECT hiredate+1 FROM hiring WHERE empno = 3400;


A. 4-FEB-01

B. 25-JAN-01

C. N-02

D. None of the above

Back 8

8. B. In date arithmetic, adding 1 is equivalent to adding 24 hours. To add 6 hours to a date value with time, add 0.25.

Front 9

9. What is the default length of a CHAR datatype column if no length is specified in the table definition?
A. 256

B. 1,000

C. 64

D. 1

E. You must always specify a length for CHAR columns.

Back 9

9. D. I f you do not specify a length for a CHAR datatype column, the default length of 1 is assumed.

Front 10

10. Which statement will remove the column UPDATE_DT from the table STATE?
A. ALTER TABLE STATE DROP COLUMN UPDATE_DT;

B. ALTER TABLE STATE REMOVE COLUMN UPDATE_DT;

C. DROP COLUMN UPDATE_DT FROM STATE;

D. ALTER TABLE STATE SET UNUSED COLUMN UPDATE_DT;

E. You cannot drop a column from the table.

Back 10

10. A. Y ou can use the DROP COLUMN clause with the ALTER TABLE statement to drop a column. There is no separate DROP COLUMN statement or a REMOVE clause
in the ALTER TABLE statement. The SET UNUSED clause is used to mark the column as unused. This column can be dropped later using the DROP UNUSED
COLUMNS clause.

Front 11

11. Which actions are allowed on a table that is marked as read-only? (Choose all that apply.)
A. Truncating a table

B. Inserting new data

C. Dropping a constraint

D. Dropping an index

E. Dropping a table

Back 11

11. C, D, E. All actions that do not modify the data in the table are permitted on a read-only table. The actions of creating/dropping a constraint,
creating/dropping an index, and dropping a table are allowed. Though truncating is a DDL action, it is not permitted since the data in the table is
affected.

Front 12

12. Which of the following statements will create a primary key for the CITY table with the columns STATE_CD and CITY_CD?
A. CREATE PRIMARY KEY ON CITY (STATE_CD, CITY_CD);
B. CREATE CONSTRAINT PK_CITY PRIMARY KEY ON CITY (STATE_CD, CITY_CD);
C. ALTER TABLE CITY ADD CONSTRAINT PK_CITY PRIMARY KEY (STATE_CD, CITY_CD);
D. ALTER TABLE CITY ADD PRIMARY KEY (STATE_CD, CITY_CD);
E. ALTER TABLE CITY ADD PRIMARY KEY CONSTRAINT PK_CITY ON (STATE_CD, CITY_CD);

Back 12

12. C, D. The ALTER TABLE statement is used to create and remove constraints. CREATE PRIMARY KEY and CREATE CONSTRAINT are invalid statements. A
constraint is always added to an existing table using the ALTER TABLE statement.

Front 13

13. Which of the following check constraints will raise an error? (Choose all that apply.)
A. CONSTRAINT ck_gender CHECK (gender IN ('M', 'F'))

B. CONSTRAINT ck_old_order CHECK (order_date > (SYSDATE - 30))

C. CONSTRAINT ck_vendor CHECK (vendor_id IN (SELECT vendor_id FROM vendors))

D. CONSTRAINT ck_profit CHECK (gross_amt > net_amt)

Back 13

13. B, C. Check constraints cannot reference the SYSDATE function or other tables.

Front 14

14. Consider the datatypes DATE, TIMESTAMP (TS), TIMESTAMP WITH LOCAL TIME ZONE (TSLTZ), INTERVAL YEAR TO MONTH (IY2M),
and INTERVAL DAY TO SECOND (ID2S). Which operations are not allowed by Oracle Database 11g? (Choose all that apply.)
A. DATE+DATE

B. TSLTZ–DATE

C. TSLTZ+IY2M

D. TS*5

E. ID2S/2

F. IY2M+IY2M

G. ID2S+IY2M

H. DATE–IY2M

Back 14

14. A, D, G. Y ou cannot add two DATE datatypes, but you can subtract to find the difference in days. Multiplication and division operators are
permitted only on INTERVAL datatypes. When adding or subtracting INTERVAL datatypes, both INTERVAL datatypes should be of the same
category.

Front 15

15. A constraint is created with the DEFERRABLE INITIALLY IMMEDIATE clause. What does this mean?
A. Constraint checking is done only at commit time.

B. Constraint checking is done after each SQL statement is executed, but you can change this behavior by specifying SET CONSTRAINTS ALL
DEFERRED.

C. Existing rows in the table are immediately checked for constraint violation.

D. The constraint is immediately checked in a DML operation, but subsequent constraint verification is done at commit time.

Back 15

15. B. DEFERRABLE specifies that the constraint can be deferred using the SET CONSTRAINTS command. INITIALLY IMMEDIATE specifies that the constraint’s
default behavior is to validate the constraint for each SQL statement executed.

Front 16

16. What is the default precision for fractional seconds in a TIMESTAMP datatype column?
A. 0

B. 2

C. 6

D. 9

Back 16

16. C. The default precision is 6 digits. The precision can range from 0 to 9.

Front 17

17. Which datatype shows the time-zone information along with the date value?
A. TIMESTAMP

B. TIMESTAMP WITH LOCAL TIME ZONE

C. TIMESTAMP WITH TIME ZONE

D. DATE

E. Both options B and C

Back 17

17. C. Only TIMESTAMP WITH TIME ZONE stores the time-zone information as a displacement from UTC. TIMESTAMP WITH LOCAL TIME
ZONE adjusts the time to the database’s time zone before storing it.

Front 18

18. Y ou have a large job that will load many thousands of rows into your ORDERS table. T o speed up the loading process, you want to temporarily stop
enforcing the foreign key constraint FK_ORDERS. Which of the following statements will satisfy your requirement?
A. ALTER CONSTRAINT FK_ORDERS DISABLE;

B. ALTER TABLE ORDERS DISABLE FOREIGN KEY FK_ORDERS;

C. ALTER TABLE ORDERS DISABLE CONSTRAINT FK_ORDERS;

D. ALTER TABLE ORDERS DISABLE ALL CONSTRAINTS;

Back 18

18. C. Y ou can disable a constraint by specifying its constraint name. Y ou may enable the constraint after the load and avoid the constraint
checking while enabling using the ALTER TABLE ORDERS MODIFY CONSTRAINT FK_ORDERS ENABLE NOVALIDATE; command.

Front 19

19. Y ou are connected to the database as user JOHN. Y ou need to rename a table named NORDERS to NEW_ORDERS, owned by SMITH. Consider the following
wo statements:
1. RENAME SMITH.NORDERS TO NEW_ORDERS;
2. ALTER TABLE SMITH.NORDERS RENAME TO NEW_ORDERS;
Which of the following is correct?
A. Statement 1 will work; statement 2 will not.
B. Statements 1 and 2 will work.
C. Statement 1 will not work; statement 2 will work.
D. Statements 1 and 2 will not work.

Back 19

19. C. RENAME can be used to rename objects owned by the user. ALTER TABLE should be used to rename tables owned by another user. T o do so, you
must have the ALTER privilege on the table or the ALTER ANY TABLE privilege.

Front 20

20. Tom executed the following SQL statement.
create table xx (n number, x long, y clob);


Choose the best option.
A. A table named xx will be created.

B. Single-character column names are not allowed in table definitions.

C. When using the LONG datatype, other LOB datatypes cannot be used in table definitions.

D. One of the datatypes used in the column definition needs the size specified.

Back 20

20. A. The table will be created without error. A table cannot have more than one LONG column, but LONG and multiple LOB columns can exist
together. I f a LONG or LONG RAW column is defined, another LONG or LONG RAW column cannot be used.