Equality, non-equality, and self-joins are broadly categorized as outer joins.
True/False
False
The NATURAL JOIN keywords can be used to link two tables that have a commonly named and defined column.
True/False
True
The MINUS set operator is used to display rows that were uniquely returned by the first query in the set.
True/False
True
The most common type of join is an equijoin, which joins two or more tables together based upon the tables having equivalent data values in a common column.
True/False
True
An outer join operator can be included in a FROM clause to list all rows from one table that do not have a corresponding row in the other table.
True/False
False
When combining the results of two SELECT statements with the MINUS keyword, duplicate rows are suppressed in the results.
True/False
False
An outer join operator consists of a minus sign enclosed in parentheses, (-).
True/False
False
An outer join only lists rows that contain a match in both tables.
True/False
False
The outer join operator is placed on the side of the joining condition that references
the table containing the deficient rows.
True/False
True
A(n) inner join will only include rows that have matching rows in the other table.
True/False
True
The INTERSECT set operator only displays the rows returned by both queries.
True/False
True
When combining the results of two SELECT statements with the UNION keyword, duplicate rows are suppressed in the results.
True/False
True
The ON clause can be used only if the tables being joined have a common column with the same name.
True/False
False
The USING clause must be used with the JOIN keyword when linking tables that do not contain a commonly named column.
True/False
False
The UNION set operator will not suppress rows that are returned by both queries.
True/False
False
If a table alias is assigned in the SELECT clause, it must be used any time the table is referenced in that SQL statement.
True/False
False
A Cartesian join can be created by not including a joining condition in the WHERE clause of a SELECT statement.
True/False
True
If you are joining five tables in a SELECT statement, five joining conditions will be required.
True/False
False
A table alias is assigned to a table in the WHERE clause.
True/False
False
The number of joining conditions required to join tables is always one less than the number of tables being joined.
True/False
True
Set operators are used to combine the results of multiple queries.
True/False
True
Column qualifiers must be included in the WHERE clause if the columns used to join the tables have the same column names.
True/False
True
A Cartesian join usually results from the user omitting the joining condition that links two or more tables together.
True/False
True
A(n) non-equality join is when a table is joined to itself.
True/False
False
The JOIN keyword must be used in the WHERE clause of a SELECT statement.
True/False
False
In Oracle12c, tables can be linked through which clause(s)?
D. both b and c
Which of the following SQL statements will list the name of each customer stored in the customers table, and, if the customer has placed an order that is contained in the ORDERS table, the order# of any order each customer has placed?
A. SELECT lastname, firstname, order#
FROM orders
RIGHT OUTER JOIN customers
USING (customer#);
B. SELECT lastname, firstname, order#
FROM orders
LEFT OUTER JOIN customers
USING (customer#);
C. SELECT lastname, firstname, order#
FROM orders
FULL OUTER JOIN customers
USING (customer#);
D. both a and c
D. both a and c
Which of the following SQL statements will display books that have not been ordered recently?
A. SELECT title
FROM books, orderitems
WHERE books.isbn <> orderitems.isbn;
B. SELECT title
FROM books NATURAL JOIN orderitems
WHERE JOIN IS NULL;
C. SELECT title
FROM books NATURAL JOIN orderitems
MINUS SELECT title FROM books;
D. SELECT title FROM books
MINUS
SELECT title FROM books
NATURAL JOIN orderitems;
D. SELECT title FROM books
MINUS
SELECT title FROM books
NATURAL JOIN orderitems;
How many joining conditions will be required in an SQL statement that is used to determine the gift that corresponds to each book in the BOOKS table?
D. 1
Which of the following keywords can be used to join two tables that do not contain a commonly named and defined column?
B. JOIN...ON
Which of the following SQL statements will display the publisher name, book title, and retail price of all books that cost more than $35.95?
A. SELECT name, title, retail
FROM books, publisher
WHERE cost > 35.95;
B. SELECT name, title, retail
FROM books
NATURAL JOIN publisher
WHERE cost > 35.95;
C. SELECT p.name, b.title, b.retail
FROM books b
NATURAL JOIN publisher p
WHERE b.cost > 35.95;
D. none of the above
B. SELECT name, title, retail
FROM books
NATURAL JOIN publisher
WHERE cost > 35.95;
To display the name of each customer and the title of each book purchased by the customers would require how many join conditions?
B. 3
To display the name of each customer and the ISBN of each book purchased by the customers would require how many joins in the FROM clause of the SQL statement?
C. 2
Which of the following is used to create an outer join in a WHERE clause?
C. outer join operator (+)
Which of the following queries will display the first and last name of the individual who referred another customer, along with the customer# of the referred customer?
A. SELECT r.firstname, r.lastname, c.customer#
FROM customers r, customers c
WHERE r.customer# = c.referred;
B. SELECT r.firstname, r.lastname, c.customer#
FROM customers r JOIN customers c
ON r.customer# = c.referred;
C. SELECT r.firstname, r.lastname, c.customer#
FROM customers r
NATURAL JOINcustomers c;
D. both a and b
D. both a and b
Which of the following SQL statements will display the name of each publisher that publishes a book classified in the COMPUTER category?
A. SELECT UNIQUE name
FROM books, publisher;
B. SELECT UNIQUE name
FROM books NATURAL JOIN publisher
WHERE category = 'COMPUTER';
C. SELECT DISTINCT name
FROM books JOIN publisher
WHERE category = 'COMPUTER';
D. both b and c
B. SELECT UNIQUE name
FROM books NATURAL JOIN publisher
WHERE category = 'COMPUTER';
Which of the following terms refers to a
column with equivalent data that exists in two or more tables?
C. common column
Which of the following set operators will display the results of the combined SQL statements without suppressing duplicate rows?
D. UNION ALL
The outer join operator in the WHERE clause cannot be used with which of the following operators?
D. both a and b
In which of the following examples is the ORDERS table used as a column qualifier?
D. orders.order#
Which of the following SQL statements will display the title of all books that have had multiple copies requested in a single order?
A. SELECT title
FROM books NATURAL JOIN orderitems
WHERE qty > 1;
B. SELECT title
FROM books JOIN orderitems
WHERE qty > 1;
C. SELECT title
FROM books JOIN orderitems
ON (isbn) JOIN orders ON (order#)
WHERE qty>1;
D. SELECT title
FROM books
JOIN orderitems USING(isbn);
A. SELECT title
FROM books NATURAL JOIN orderitems
WHERE qty > 1;
Which of the following SQL statements will display the title and cost of each book stored in the BOOKS table, as well as the name of the contact person and the phone number to call to reorder the book?
A. SELECT title, cost, contact, phone
FROM publisher, books;
B. SELECT title, cost, contact, phone
FROM publisher JOIN books
USING (pubid);
C. SELECT title, cost, contact, phone
FROM publisher JOIN books
USING (isbn);
D. SELECT title, cost, contact, phone
FROM publisher JOIN books
USING (contact);
B. SELECT title, cost, contact, phone
FROM publisher JOIN books
USING (pubid);
The JOIN keyword is included in which of the following clauses?
C. FROM
Which of the following set operators can be used to make certain that only the rows returned by both queries are displayed in the results?
B. INTERSECT
Which of the following SQL statements will list the name of each customer stored in the CUSTOMERS table, and, if the customer has placed an order that is contained in the ORDERS table, the order# of any order each customer has placed?
A. SELECT lastname, firstname, order#
FROM customers NATURAL JOIN orders
WHERE orders.customer# IS NOT NULL;
B. SELECT lastname, firstname, order#
FROM customers, orders
WHERE orders.customer# (+) = customers.customer#;
C. SELECT lastname, firstname, order#
FROM customers, orders
WHERE orders.customer# = customers.customer# (+);
D. SELECT lastname, firstname, order#
FROM customers NATURAL JOIN orders
WHERE orders.customer# IS NULL;
B. SELECT lastname, firstname, order#
FROM customers, orders
WHERE orders.customer# (+) = customers.customer#;
Which of the following SQL statements will display the title of each book in the BOOKS table and the name of its publisher?
A. SELECT title, name
FROM publisher, books;
B. SELECT title, name
FROM publisher NATURAL JOIN books;
C. SELECT title, name
FROM publisher, books
WHERE p.pubid = b.pubid;
D. both b and c
B. SELECT title, name
FROM publisher NATURAL JOIN books;
If you are attempting to join two tables that have multiple common columns, which of the following JOIN keywords should be used to specify how the tables should be linked?
C. JOIN...USING
A join based upon a column from each table containing equivalent data is known as a(n)
C. equality join
Which of the following types of joins is created by matching equivalent values in each table?
D. equality join
Which of the following is an example of assigning "o" as a table alias for the ORDERS table in the FROM clause?
