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Oracle Database SQL Sample Questions (Q295-Q300):

NEW QUESTION # 295
Examine the structure of the employees table.

There is a parent/child relationship betweenEMPLOYEE_IDandMANAGER_ID.
You want to display the last names and manager IDs of employees who work for the same manager asthe employee whoseEMPLOYEE_ID123.
Which query provides the correct output? A)

B)

C)

D)

A. Option B
B. Option C
C. Option A
D. Option D

Answer: A

NEW QUESTION # 296
View the Exhibit and examine the details of the PRODUCT_INFORMATION table.

You have the requirement to display PRODUCT_NAME and LIST_PRICE from the table where the CATEGORYJD column has values 12 or 13, and the SUPPLIER_ID column has the value 102088. You executed the following SQL statement:
SELECT product_name, list_price
FROM product_information
WHERE (category_id = 12 AND category_id = 13) AND supplier_id = 102088; Which statement is true regarding the execution of the query?

A. It would execute and return the desired.
B. It would not execute because the same column has been used twice with the AND logical operator.
C. It would not execute because the entire WHERE clause is not enclosed within parentheses.
D. It would execute but would return no rows.

Answer: D

NEW QUESTION # 297
You must create a table EMPLOYEES in which the values in the columns EMPLOYEES_ID and LOGIN_ID must be unique and not null.
Which two SQL statements would create the required table? (Choose two.) CREATE TABLE employees

A. (employee_id NUMBER,
login_id NUMBER,
employee_name VARCHAR2(100),
hire_date DATE,
CONSTRAINT emp_id_uk UNIQUE (employee_id, login_id);
CONSTRAINT emp_id_nn NOT NULL (employee_id, login_id));
CREATE TABLE employees
B. (employee_id NUMBER,
login_id NUMBER,
employee_name VARCHAR2(100),
hire_date DATE,
CONSTRAINT emp_id_uk UNIQUE (employee_id, login_id));
CREATE TABLE employees
C. (employee_id NUMBER,
login_id NUMBER,
employee_name VARCHAR2(25),
hire_date DATE,
CONSTRAINT emp_id_pk PRIMARY KEY (employee_id, login_id));
CREATE TABLE employees
D. (employee_id NUMBER CONSTRAINT emp_id_nn NOT NULL,
login_id NUMBER CONSTRAINT login_id_nn NOT NULL,
employee_name VARCHAR2(100),
hire_date DATE,
CONSTRAINT emp_num_id_uk UNIQUE (employee_id, login_id));
E. (employee_id NUMBER CONSTRAINT emp_id_pk PRIMARY KEY,
login_id NUMBER UNIQUE,
employee_name VARCHAR2(25),
hire_date DATE);
CREATE TABLE employees

Answer: C,D

Explanation:
Explanation

NEW QUESTION # 298
Examine this description of the PRODUCTS table:

Rows exist in this table with data in all the columns. You put the PRODUCTS table in read-only mode. Which three commands execute successfully on PRODUCTS?

A. DROP TABLE products
B. CREATE INDEX price_idx on products (price);
C. ALTER TABLE products SET UNUSED(expiry_date);
D. ALTER TAELE products DROP COLUMN expiry_date;
E. ALTER TABLE products DROP UNUSED COLUMNS
F. TRUNCATE TABLE products;

Answer: A,B,E

Explanation:
B . CREATE INDEX price_idx on products (price); E. ALTER TABLE products DROP UNUSED COLUMNS; F . DROP TABLE products.
Comprehensive and Detailed Explanation WITH all Reference:
When a table is in read-only mode, most types of modifications are prohibited. However, certain operations can still be performed.
A . Incorrect. You cannot drop a column from a table that is in read-only mode, as it is a modifying operation. B. Correct. You can create an index on a read-only table. Creating an index does not modify the actual rows within the table; it builds a separate structure used for faster access. C. Incorrect. The SET UNUSED statement marks one or more columns as unused so they can be dropped when the database is not busy. This operation is considered a modifying operation and therefore is not allowed on a read-only table. D. Incorrect. Truncate is a DDL operation that would delete all rows from a table. This operation is not allowed on a read-only table. E. Correct. The ALTER TABLE ... DROP UNUSED COLUMNS statement is used to drop columns that have been previously marked as unused using the SET UNUSED statement. This operation is allowed because it only affects previously marked unused columns, not actively used data. F. Correct. Dropping a table is allowed even if it's in read-only mode because it is a DDL operation that does not operate on the rows of the table but rather on the object itself.
The behavior of read-only tables and the operations that can be performed on them are detailed in the Oracle Database SQL Language Reference and Oracle Database Administrator's Guide.

NEW QUESTION # 299
Which two are true about multiple table INSERT statements?

A. The conditional INSERT FIRST statement always inserts a row into a single table.
B. They always use subqueries.
C. They can transform a row from a source table into multiple rows in a target table.
D. The conditional INSERT ALL statement inserts rows into a single table by aggregating source rows.
E. The unconditional INSERT ALL statement must have the same number of columns in both the source and target tables.

Answer: B,C

NEW QUESTION # 300
......

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