Deck 7: Advanced SQL

Question 1

In order to embed SQL inside of another language, the ________ statement must be placed before the SQL in the host language.

A) GET SQL
B) EXEC SQL
C) RUN SQL
D) SQL SQL

Answer 1

B

Question 2

User-defined transactions can improve system performance because:

A) transactions are processed as sets, reducing system overhead.
B) transactions are mapped to SQL statements.
C) speed is decreased due to query optimization.
D) all triggers delete rows.

Answer 2

A

Question 3

The following code would include: SELECT Customer_T.CustomerID, Order_T.CustomerID,
CustomerName, OrderID
FROM Customer_T, Order_T
WHERE Customer_T.CustomerID = Order_T. CustomerID;

A) all rows of the Order_T Table regardless of matches with the Customer_T Table.
B) all rows of the Customer_T Table regardless of matches with the Order_T Table.
C) only rows that match both Customer_T and Order_T Tables.
D) only rows that don't match both Customer_T and Order_T Tables.

Answer 3

C

Question 4

Embedded SQL consists of:

A) hard-coded SQL statements included in a program written in another language.
B) SQL encapsulated inside of other SQL statements.
C) SQL written into a front-end application.
D) SQL translated to a lower-level language.

Question 5

The following code would include: SELECT Customer_T.CustomerID,CustomerName, OrderID
FROM Customer_T LEFT OUTER JOIN Order_T ON
Customer_T.CustomerID = Order_T.CustomerID;

A) all rows of the Order_T Table regardless of matches with the Customer_T Table.
B) all rows of the Customer_T Table regardless of matches with the Order_T Table.
C) only rows that match both Customer_T and Order_T Tables.
D) only rows that don't match both Customer_T and Order_T Tables.

Question 6

An interactive command that can be used to dynamically control a user session for appropriate integrity measures is:

A) rollback.
B) rollforward.
C) set autocommit.
D) expunge.

Question 7

A join that is based upon equality between values in two common columns with the same name and where one duplicate column has been removed is called a(n):

A) equi-join.
B) natural join.
C) multivariate join.
D) inner join.

Question 8

A join operation:

A) brings together data from two different fields.
B) causes two tables with a common domain to be combined into a single table or view.
C) causes two disparate tables to be combined into a single table or view.
D) is used to combine indexing operations.

Question 9

In order for two queries to be UNION-compatible, they must:

A) both have the same number of lines in their SQL statements.
B) both output compatible data types for each column and return the same number of rows.
C) both return at least one row.
D) both return exactly one row.

Question 10

The following code is an example of a(n): SELECT Customer_T.CustomerID, Order_T.CustomerID,
CustomerName, OrderID
FROM Customer_T, Order_T
WHERE Customer_T.CustomerID = Order_T. CustomerID;

A) equi-join.
B) subquery.
C) Full Outer JOIN.
D) Right Outer JOIN.

Question 11

The most commonly used form of join operation is the:

A) outer join.
B) union join.
C) equi-join.
D) natural join.

Question 12

Establishing IF-THEN-ELSE logical processing within an SQL statement can be accomplished by:

A) using the if-then-else construct.
B) using the immediate if statement.
C) using the CASE keyword in a statement.
D) using a subquery.

Question 13

All of the following are guidelines for better query design EXCEPT:

A) understand how indexes are used in query processing.
B) use a lot of self-joins.
C) write simple queries.
D) retrieve only the data that you need.

Question 14

A ________ is a temporary table used in the FROM clause of an SQL query.

A) correlated subquery
B) derived table
C) view table
D) trigger

Question 15

Explicit commands to manage transactions are needed when:

A) a transaction consists of just one SQL command.
B) multiple SQL commands must be run as part of a transaction.
C) autocommit is set to off.
D) DDL statements are prohibited.

Question 16

The UNION clause is used to:

A) combine the output from multiple queries into a single result table.
B) join two tables together to form one table.
C) find all rows that do not match in two tables.
D) find all rows that are in one table, but not the other.

Question 17

The ________ operator is used to combine the output from multiple queries into a single result table.

A) INTERSECT
B) DIVIDE
C) COLLATE
D) UNION

Question 18

A join in which the joining condition is based on equality between values in the common columns is called a(n):

A) equi-join.
B) unilateral join.
C) natural join.
D) both A and C.

Question 19

Dynamic SQL:

A) is used to generate appropriate SQL code on the fly as an application is processing.
B) is quite volatile.
C) is not used widely on the Internet.
D) creates a less flexible application.

Question 20

The following code would include: SELECT Customer_T.CustomerID,CustomerName, OrderID
FROM Customer_T RIGHT OUTER JOIN Order_T ON
Customer_T.CustomerID = Order_T.CustomerID;

A) all rows of the Order_T Table regardless of matches with the Customer_T Table.
B) all rows of the Customer_T Table regardless of matches with the Order_T Table.
C) only rows that match both Customer_T and Order_T Tables.
D) only rows that don't match both Customer_T and Order_T Tables.

Question 21

A named set of SQL statements that are considered when a data modification occurs are called:

A) stored procedures.
B) treatments.
C) triggers.
D) trapdoors.

Question 22

In SQL, a(n) ________ subquery is a type of subquery in which processing the inner query depends on data from the outer query.

A) correlated
B) paired
C) natural
D) inner

Question 23

The outer join syntax does not apply easily to a join condition of more than ________ tables.

A) two
B) three
C) four
D) five

Question 24

What results would the following SQL statement produce? select owner, table_name
From dba_tables
Where table_name = 'CUSTOMER';

A) A listing of all customers in the customer table
B) A listing of the owner of the customer table
C) A listing of the owner of the customer table as well as customers
D) An error message

Question 25

A type of query that is placed within a WHERE or HAVING clause of another query is called a:

A) master query.
B) subquery.
C) superquery.
D) multi-query.

Question 26

In which of the following situations would one have to use an outer join in order to obtain the desired results?

A) A report is desired that lists all customers who placed an order.
B) A report is desired that lists all customers and the total of their orders.
C) A report is desired that lists all customers and the total of their orders during the most recent month, and includes customers who did not place an order during the month (their total will be zero).
D) There is never a situation that requires only an outer join.

Question 27

If the DBA wishes to describe all tables in the database, which data dictionary view should be accessed in Oracle?

A) DBA_TAB_PRIVS
B) DBA_TAB_COMMENTS
C) DBA_TABLE_LABEL
D) DBA_TABLES

Question 28

SQL-invoked routines can be:

A) part of a DDL statement.
B) functions or procedures.
C) part of a DCL statement.
D) contained within a CREATE statement.

Question 29

The ________ DBA view shows information about all users of the database in Oracle.

A) DBA_USERS
B) USERS
C) DBA_VIEWS
D) DBA_INDEXES

Question 30

SQL provides the ________ technique, which involves placing an inner query within the WHERE or HAVING clause of an outer query.

A) grouping
B) joining
C) subquery
D) union

Question 31

A join in which rows that do not have matching values in common columns are still included in the result table is called a(n):

A) natural join.
B) equi-join.
C) outer join.
D) union join.

Question 32

All of the following are part of the coding structure for triggers EXCEPT:

A) event.
B) condition.
C) selection.
D) action.

Question 33

One major advantage of the outer join is that:

A) information is easily accessible.
B) information is not lost.
C) the query is easier to write.
D) information's data type changes.

Question 34

________ takes a value of TRUE if a subquery returns an intermediate results table which contains one or more rows.

A) In
B) Having
C) Exists
D) Extents

Question 35

While triggers run automatically, ________ do not and have to be called.

A) trapdoors
B) routines
C) selects
D) updates

Question 36

The following code is an example of a: SELECT CustomerName, CustomerAddress, CustomerCity, CustomerState,
CustomerPostalCode
FROM Customer_T
WHERE Customer_T.CustomerID =
(SELECT Order_T.CustomerID
FROM Order_T
WHERE OrderID = 1008);

A) Correlated subquery.
B) Subquery.
C) JOIN.
D) FULL OUTER JOIN.

Question 37

________ use the result of the outer query to determine the processing of the inner query.

A) Correlated subqueries
B) Outer subqueries
C) Inner subqueries
D) Subqueries

Question 38

An operation to join a table to itself is called a(n):

A) sufficient-join.
B) inner join.
C) outer join.
D) self-join.

Question 39

A type of join where a table is joined to itself is called a(n):

A) ternary join.
B) self-join.
C) unnatural join.
D) pinned join.

Question 40

EXISTS will take a value of ________ if the subquery returns an intermediate results table which contains one or more rows.

A) FALSE
B) 1
C) TRUE
D) undefined

Question 41

User-defined data types:

A) are not allowed in any DBMS.
B) are only allowed in Oracle.
C) can have defined functions and methods.
D) can be used once in a system.

Question 42

An equi-join is a join in which one of the duplicate columns is eliminated in the result table.

Question 43

Extensions defined in SQL-99 that include the capability to create and drop modules of code stored in the database schema across user sessions are called:

A) stored procedures.
B) Persistent Stored Modules.
C) flow control modules.
D) global triggers.

Question 44

A join in which the joining condition is based on equality between values in the common column is called an equi-join.

Question 45

A transaction is the complete set of closely related update commands that must all be done, or none of them done, for the database to remain valid.

Question 46

RANK and DENSE-RANK are examples of:

A) ceilings.
B) door functions.
C) window functions.
D) moving functions.

Question 47

Specifying the attribute names in the SELECT statement will make it easier to find errors in queries and also correct for problems that may occur in the base system.

Question 48

It is better not to have a result set identified before writing GROUP BY and HAVING clauses for a query.

Question 49

Figuring out what attributes you want in your query before you write the query will help with query writing.

Question 50

The joining condition of an equi-join is based upon an equality.

Question 51

All of the following are new data types added in SQL:2008 EXCEPT:

A) BIGINT.
B) BIT.
C) MULTISET.
D) XML.

Question 52

Combining a table with itself results in a faster query.

Question 53

IF-THEN-ELSE logical processing cannot be accomplished within an SQL statement.

Question 54

________ differs from array because it can contain duplicates.

A) BIGINT
B) XML
C) MULTISET
D) TABLE

Question 55

A new set of analytical functions added in SQL:2008 is referred to as:

A) OLAF functions.
B) MOLAP functions.
C) average functions.
D) OLAP functions.

Question 56

All of the following are advantages of SQL-invoked routines EXCEPT:

A) flexibility.
B) efficiency.
C) sharability.
D) security.

Question 57

Transaction integrity commands are not used to identify whole units of database changes that must be completed in full for the database to retain integrity.

Question 58

The MERGE command:

A) allows one to combine the INSERT and UPDATE operations.
B) allows one to combine the INSERT and DELETE operations.
C) joins 2 tables together.
D) is always a single table operation.

Question 59

A procedure is:

A) stored outside the database.
B) given a reserved SQL name.
C) called by name.
D) unable to be modified.

Question 60

The UNION clause is used to combine the output from multiple queries into a single result table.

Question 61

There is a special operation in SQL to join a table to itself.

Question 62

The following queries produce the same results.
Select DISTINCT customer_name, customer_city
from customer, salesman
where customer.salesman_id = salesman.salesman_id
and salesman.lname = 'SMITH';
select customer_name, customer_city
from customer
where customer.salesman_id =
(select salesman_id
from salesman
where lname = 'SMITH');

Question 63

EXISTS takes a value of false if the subquery returns an intermediate result set.

Question 64

The following code is an example of a Subquery.
SELECT Customer_T.CustomerID, Order_T.CustomerID,
CustomerName, OrderID
FROM Customer_T, Order_T
WHERE Customer_T.CustomerID = Order_T. CustomerID;

Question 65

When EXISTS or NOT EXISTS is used in a subquery, the select list of the subquery will usually just select all columns as a placeholder because it doesn't matter which columns are returned.

Question 66

The following code is an example of a correlated subquery.
SELECT CustomerName, CustomerAddress, CustomerCity, CustomerState,
CustomerPostalCode
FROM Customer_T
WHERE Customer_T.CustomerID =
(SELECT Order_T.CustomerID
FROM Order_T
WHERE OrderID = 1008);

Question 67

In order to find out what customers have not placed an order for a particular item, one might use the NOT qualifier along with the IN qualifier.

Question 68

When a subquery is used in the FROM clause, it is called a denied table.

Question 69

Joining tables or using a subquery may produce the same result.

Question 70

A natural join is the same as an equi-join, except that it is performed over matching columns that have been defined with the same name, and one of the duplicate columns is eliminated.

Question 71

An SQL query that implements an outer join will return rows that do not have matching values in common columns.

Question 72

Subqueries can only be used in the WHERE clause.

Question 73

A correlated subquery is executed once for each iteration through the outer loop.

Question 74

The natural join is very rarely used.

Question 75

Using an outer join produces this information: rows that do not have matching values in common columns are not included in the result table.

Question 76

Correlated subqueries are less efficient than queries that do not use nesting.

Question 77

A subquery in which processing the inner query depends on data from the outer query is called a codependent query.

Question 78

One major disadvantage of the outer join is that information is easily lost.

Question 79

The following query will execute without errors.
select customer.customer_name, salesman.sales_quota
from customer
where customer.salesman_id =
(select salesman_id
where lname = 'SMITH');

Question 80

The following SQL statement is an example of a correlated subquery.
select first_name, last_name, total_sales
from salesman s1
where total_sales > all
(select total_sales from salesman s2
where s1.salesman_id != s2.salesman_id);