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Oracle Database SQL Sample Questions (Q414-Q419):

NEW QUESTION # 414
Examine the description of the BOOKS_TRANSACTIONS table:

Examine this partial SQL statement:
SELECT * FROM books_transactions
Which two WHERE conditions give the same result?

A. WHERE borrowed_date = SYSDATE AND (transaction_type = 'RM' AND member_id = 'A101' OR member_id = 'A102');
B. WHERE borrowed_date = SYSDATE AND (transaction_type = 'RM' AND (member_id = A101' OR member_id = 'A102'));
C. WHERE borrowed_date = SYSDATE AND transaction_type = 'RM' OR member_id IN ('A101', 'A102');
D. WHERE borrowed_date = SYSDATE AND (transaction_type = 'RM' OR member_id IN ('A101', 'A102'));
E. WHERE (borrowed_date = SYSDATE AND transaction_type = 'RM') OR member_id IN ('A101', 'A102');

Answer: B,E

NEW QUESTION # 415
Examine these statements:
CREATE TABLE alter_test (c1 VARCHAR2(10), c2 NUMBER(10));
INSERT INTO alter_test VALUES ('123' 123);
COMMIT;
Which is true ahout modifyIng the columns in AITER_TEST?

A. c1 can be changed to NUMBER(10) but c2 cannot be changed to VARCHAN2 (10).
B. c2 can be changed to VARCHAR2(10) but c1 cannot be changed to NUMBER (10).
C. c2 can be changed to NUMBER(5) but c1 cannot be changed to VARCHAN2 (5).
D. c1 can be changed to NUMBER(10) and c2 can be changed to VARCHAN2 (10).
E. c1 can be changed to VARCHAR2(5) and c2 can be changed to NUMBER (12,2).

Answer: E

Explanation:
In Oracle SQL, the ALTER TABLE statement is used to modify the definition of a table after it has been created. Specific changes are allowed depending on the current data type of the column and the data it contains.
A). You cannot change a VARCHAR2 column to NUMBER if the table contains rows with non-numeric values, which is the case with '123' as a VARCHAR2; it is a string, not a number.
B). You can reduce the size of a NUMBER column if the data will still fit within the new precision, but you cannot change a VARCHAR2 column to a smaller size if it contains values that exceed the new size limit.
C). You cannot change a NUMBER column to VARCHAR2 if the table contains rows because the existing data type of NUMBER does not match the new data type of VARCHAR2.
D). Similar to A, you cannot change the data type from VARCHAR2 to NUMBER if non-numeric data is present.
E). You can change a VARCHAR2(10) column to VARCHAR2(5) if all existing rows have values that fit within the new size, and you can change a NUMBER column to have a different scale (NUMBER(12,2)).
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"

NEW QUESTION # 416
View the exhibit and examine the structure of the CUSTOMERS table.
Which two tasks would require subqueries or joins to be executed in a single statement?

A. listing of customers who do not have a credit limit and were born before 1980
B. listing of those customers, whose credit limit is the same as the credit limit of customers residing in the city 'Tokyo'.
C. finding the average credit limit of male customers residing in 'Tokyo' or 'Sydney'
D. finding the number of customers, in each city, who's marital status is 'married'.
E. finding the number of customers, in each city, whose credit limit is more than the average credit limit of all the customers

Answer: B,E

NEW QUESTION # 417
Which three actions can you perform only with system privileges?

A. Execute a procedure in another schema.
B. Truncate a table in another schema.
C. Access flat files via a database, which are stored in an operating system directory.
D. Log in to a database.
E. Query any table in a database.
F. Use the WITH GRANT OPTION clause.

Answer: B,C,D

Explanation:
A). Correct. Truncating a table, especially in another schema, requires the ALTER ANY TABLE or DROP ANY TABLE system privilege. B. Correct. Accessing external files through the database involves the CREATE ANY DIRECTORY privilege, which is a system privilege. C. Correct. Creating a session in a database, which is required to log in, necessitates the CREATE SESSION system privilege. D. Incorrect.
Querying any table is an object privilege, which can be granted by the owner of the table. E. Incorrect. The WITH GRANT OPTION clause is used with object privileges, not system privileges. F. Incorrect. Executing a procedure in another schema requires the EXECUTE object privilege on that procedure.
Oracle Database Security Guide provides the details about system privileges necessary for these actions.

NEW QUESTION # 418
Examine the description of the EMPLOYEES table:

Which two statements will run successfully?

A. SELECT 'The first_name is ''' ||first_name||''' FROM employees ;
B. SELECT 'The first_name is '' || first_name || '' FROM employees ;
C. SELECT 'The first_name is '''||first_name ||'''' FROM employees ;
D. SELECT 'The first_name is '|| first_name|| '' FROM employees;
E. SELECT 'The first_name is \'' || first_name || '\'' FROM employees;

Answer: C,D

NEW QUESTION # 419
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