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Oracle Database SQL Sample Questions (Q26-Q31):

NEW QUESTION # 26
You execute these commands:
CREATE TABLE customers (customer id INTEGER, customer name VARCHAR2 (20)); INSERT INTO customers VALUES (1,'Custmoer1 '); SAVEPOINT post insert; INSERT INTO customers VALUES (2, 'Customer2 ');<TODO> SELECTCOUNT (*) FROM customers; Which two, used independently, can replace <TODO> so the query retums 1?

A. ROLLBACK;
B. CONOIT TO SAVEPOINT post_ insert;
C. COMMIT;
D. ROLIBACK TO SAVEPOINT post_ insert;
E. ROLLEBACK TO post_ insert;

Answer: D,E

NEW QUESTION # 27
View the Exhibit and examine the structure of the PRODUCTStable

Which two tasks would require subqueries? (Choose two.)

A. display the total number of products supplied by supplier 102and have a product status as 'OBSOLETE'
B. display all products whose PROD_MIN_PRICEis more than the average PROD_LIST_PRICEof all products, and whose status is orderable
C. display the minimum PROD_LIST_PRICEfor each product status
D. display the number of products whose PROD_LIST_PRICEis more than the average PROD_LIST_PRICE
E. display suppliers whose PROD_LIST_PRICEis less than 1000

Answer: B,D

NEW QUESTION # 28
Evaluate the following SQL statement:

Which statement is true regarding the outcome of the above query?

A. It produces an error because positional notation cannot be used in the ORDER BYclause with SET operators.
B. It produces an error because the ORDER BYclause should appear only at the end of a compound query-that is, with the last SELECTstatement.
C. It executes successfully but ignores the ORDER BYclause because it is not located at the end of the compound statement.
D. It executes successfully and displays rows in the descending order of PROMO_CATEGORY.

Answer: B

NEW QUESTION # 29
Which two statements are true regarding the COUNTfunction?

A. A SELECTstatement using the COUNTfunction with a DISTINCTkeyword cannot have a WHERE clause.
B. COUNT(DISTINCT inv_amt)returns the number of rows excluding rows containing duplicates and NULLvalues in the INV_AMTcolumn.
C. COUNT(cust_id)returns the number of rows including rows with duplicate customer IDs and NULL value in the CUST_IDcolumn.
D. COUNT (*)returns the number of rows including duplicate rows and rows containing NULLvalue in any of the columns.
E. The COUNTfunction can be used only for CHAR, VARCHAR2, and NUMBERdata types.

Answer: B,D

NEW QUESTION # 30
Examine the structure of the DEPARTMENTS table.

You execute the following command:

Which two statements are true?

A. Unique key constraints defined on the COUNTRYcolumn are removed.
B. Views created in the DEPARTMENTStable that include the COUNTRYcolumn are automatically modified and remain valid.
C. A new column, COUNTRY, can be added to the DEPARTMENTStable after executing the command.
D. Indexes created on the COUNTRYcolumn exist until the DROP UNUSED COLUMNScommand is executed.
E. Synonyms existing of the DEPARTMENTStable would have to be re-created.

Answer: A,C

NEW QUESTION # 31
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