Free Access Oracle.1z0-071.v2022-09-21.q298 Practice Test (Page 56)

Question 271

Which three statements are true about dropping and unused columns in an Oracle database?

A.A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.

B.A column that is set to NNUSED still counts towards the limit of 1000 columns per table.

C.An UNUSED column's space is remained automatically when the block containing that column is next queried.

D.An UNUSED column's space is remained automatically when the row containing that column is next queried.

E.Partition key columns cannot be dropped.

F.A DROP COLUMN command can be rolled back.

Question 272

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.JOIN

B.FULL OUTER JOIN

C.LEFT OUTER JOIN

D.RIGHT OUTER JOIN

Question 273

Which two statements are true regarding single row functions? (Choose two.)

A.MOD : returns the quotient of a division.

B.TRUNC : can be used with NUMBER and DATE values.

C.CONCAT : can be used to combine any number of values.

D.SYSDATE : returns the database server current date and time.

E.INSTR : can be used to find only the first occurrence of a character in a string.

F.TRIM : can be used to remove all the occurrences of a character from a string.

Question 274

View the Exhibit and examine the structure of the ORDERStable.

Which UPDATEstatement is valid?
UPDATE orders

A.SET order_date = '12-mar-2007',
AND order_total = TO_NUMBER(NULL)
WHERE order_id = 2455;
UPDATE orders

B.SET order_date = TO_DATE('12-mar-2007','dd-mon-yyyy'),
SET order_total = TO_NUMBER (NULL)
WHERE order_id = 2455;

C.SET order_date = '12-mar-2007',
order_total = NULL
WHERE order_id = 2455;
UPDATE orders

D.SET order_date = '12-mar-2007',
order_total IS NULL
WHERE order_id = 2455;
UPDATE orders

Question 275

Examine the structure of the DEPARTMENTS table.

You execute the following command:

Which two statements are true?

A.Unique key constraints defined on the COUNTRY column are removed.

B.A new column, COUNTRY, can be added to the DEPARTMENTS table after executing the command.

C.Views created in the DEPARTMENTS table that include the COUNTRY column are automatically modified and remain valid.

D.Synonyms existing of the DEPARTMENTS table would have to be re-created.

E.Indexes created on the COUNTRY column exist until the DROP UNUSED COLUMNS command is executed.

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Question 271

Question 272

Question 273

Question 274

Question 275

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