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It tests the candidates' knowledge of SQL Subqueries, including single-row, multiple-row, and correlated subqueries. The fifth section tests the candidates' knowledge of SQL Constraints, including primary key, foreign key, unique, not null, and check constraints. The final section tests the candidates' knowledge of SQL Data Definition Language, including CREATE, ALTER, and DROP statements. Passing 1z0-071 Exam requires a thorough understanding of SQL and its various functions and clauses. With a thorough understanding of SQL, candidates can work with databases and their related technologies with confidence and precision.

Oracle Database SQL Sample Questions (Q252-Q257):

NEW QUESTION # 252
Examine this description of the PRODUCTStable:

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

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

Answer: A,B,F

NEW QUESTION # 253
See the Exhibit and examine the structure of the PROMOTIONS table:

Using the PROMOTIONS table,
you need to find out the average cost for all promos in the range $0-2000 and $2000-5000 in
category A.
You issue the following SQL statements:

What would be the outcome?

A. It generates an error because NULL cannot be specified as a return value.
CASE Expression
Facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement:
CASE expr WHEN comparison_expr1 THEN return_expr1
[WHEN comparison_expr2 THEN return_expr2
WHEN comparison_exprn THEN return_exprn
ELSE else_expr]
END
B. It generates an error because multiple conditions cannot be specified for the WHEN clause.
C. It executes successfully and gives the required result.
D. It generates an error because CASE cannot be used with group functions.

Answer: C

NEW QUESTION # 254
View the Exhibit and examine the structure of the EMPLOYEES table.
You want to display all employees and their managers having 100 as the MANAGER_ID.
You want the output in two columns: the first column would have the LAST_NAME of the managers and the second column would have LAST_NAME of the employees.
Which SQL statement would you execute?

A. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
ON e.employee_id = m.manager_id
WHERE m.manager_id=100;
B. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
ON m.employee_id = e.manager_id
WHERE e.managerjd=100;
C. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
ON m.employee_id = e.manager_id
WHERE m.manager_id=100;
D. SELECT m.last_name "Manager", e.last_name "Employee"
FROM employees m JOIN employees e
WHERE m.employee_id = e.manager_id AND e.managerjd=100;

Answer: B

NEW QUESTION # 255
Examine the structure of the CUSTOMERS table: (Choose two.)
CUSTNO is the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result?

A. Self-join
B. Right outer-join with self-join
C. Left outer-join with self-join
D. Full outer-join with self-join
E. Subquery

Answer: A,E

NEW QUESTION # 256
View the Exhibit and examine the data in the PRODUCTS table.

You must display product names from the PRODUCTS table that belong to the 'Software/other' category with minimum prices as either $2000 or $4000 and with no unit of measure.
You issue this query:

Which statement is true?

A. It generates an error because the condition specified for the PROD_CATEGORY column is not valid.
B. It generates an error because the condition specified for PROD_UNIT_OF_MEASURE is not valid.
C. It executes successfully but returns no result.
D. It executes successfully and returns the required result.

Answer: C

NEW QUESTION # 257
......

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