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NEW QUESTION 45
View the Exhibit and examine the structure of the EMP table which is not partitioned and not an index- organized table. (Choose two.)
Evaluate this SQL statement:
ALTER TABLE emp
DROP COLUMN first_name;
Which two statements are true?
- A. The FIRST_NAME column would be dropped provided it does not contain any data.
- B. The FIRST_NAME column can be dropped even if it is part of a composite PRIMARY KEY provided the CASCADE option is added to the SQL statement.
- C. The drop of the FIRST_NAME column can be rolled back provided the SET UNUSED option is added to the SQL statement.
- D. The FIRST_NAME column would be dropped provided at least one column remains in the table.
Answer: D
NEW QUESTION 46
Which statement is true regarding the USINGclause in table joins? (Choose two.)
- A. It can be used to join a maximum of three tables.
- B. It can be used to access data from tables through equijoins as well as nonequijoins.
- C. It can be used to join tables that have columns with the same name and compatible data types.
- D. It can be used to restrict the number of columns used in a NATURALjoin.
Answer: C,D
Explanation:
Explanation/Reference:
NEW QUESTION 47
Examine thestructure of the BOOKS_TRANSACTIONS table:
You want to display the member IDs, due date, and late fee as $2 for all transactions.
Which SQL statement must you execute? A)
B)
C)
D)
- A. Option D
- B. Option A
- C. Option C
- D. Option B
Answer: C
NEW QUESTION 48
View the exhibit and examine the description of the PRODUCT_INFORMATIONtable.
Which SQL statement would retrieve from the table the number of products having LIST_PRICEas NULL?
SELECT COUNT (DISTINCT list_price)
- A. FROM product_information
WHERE list_price is NULL
SELECT COUNT (list_price) - B. FROM product_information
WHERE list_price i= NULL
SELECT COUNT (list_price) - C. FROM product_information
WHERE list_price is NULL - D. FROM product_information
WHERE list_price is NULL
SELECT COUNT (NVL(list_price, 0))
Answer: A
NEW QUESTION 49
Which statements are true? (Choose all that apply.)
- A. Both USER_OBJECTS and CAT views provide the same information about all the objects that are owned by the user.
- B. The usernames of all the users including the database administrators are stored in the data dictionary.
- C. The data dictionary is created and maintained by the database administrator.
- D. Views with the same name but different prefixes, such as DBA, ALL and USER, use the same base tables from the data dictionary.
- E. The data dictionary views consists of joins of dictionary base tables and user-defined tables.
- F. The USER_CONS_COLUMNS view should be queried to find the names of the columns to which a constraint applies.
Answer: B,D,F
Explanation:
References:
https://docs.oracle.com/cd/B10501_01/server.920/a96524/c05dicti.htm
NEW QUESTION 50
……
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