Deck 6: Introduction to SQL

Question 1

Indexes are created in most RDBMSs to:

A) provide a quicker way to store data.
B) decrease the amount of disk space utilized.
C) provide rapid random and sequential access to base-table data.
D) increase the cost of implementation.

Answer 1

C

Question 2

What does the following SQL statement do? Alter Table Customer_T
Add (Type Varchar (2));

A) Alters the Customer_T table to accept Type 2 Varchars
B) Alters the Customer_T table to be a Type 2 Varchar
C) Alters the Customer_T table, and adds a field called "Type"
D) Alters the Customer_T table by adding a 2-byte field called "Varchar"

Answer 2

C

Question 3

What does the following SQL statement do? Delete from Customer_T
Where state = 'HI';

A) Deletes all records from customer_t where the state is equal to HI
B) Removes the Customer_T table from the database
C) Deletes all records from the Customer_T table
D) Doesn't delete anything because of a syntax error

Answer 3

A

Question 4

The SQL command ________ defines a logical table from one or more tables or views.

A) create table
B) alter table
C) create view
D) create relationship

Question 5

________ is a set of commands used to update and query a database.

A) DML
B) DDL
C) DCL
D) DPL

Question 6

What does the following SQL command do? insert into Customer_T values (001,'John Smith','231 West St','Boston','MA','02115');

A) Adds a new record to the Customer_T
B) Creates the Customer_T table
C) Deletes the Customer_T table
D) Updates the Customer_T table

Question 7

Relational databases are heavily based on the mathematical concept of:

A) Set Theory.
B) Bet Theory.
C) Get Theory.
D) Met Theory.

Question 8

Any create command may be reversed by using a(n) ________ command.

A) undo
B) drop
C) delete
D) unpack

Question 9

________ is a set of commands used to control a database, including security.

A) DML
B) DDL
C) DCL
D) DPL

Question 10

In an SQL statement, which of the following parts states the conditions for row selection?

A) Select
B) From
C) Where
D) Group By

Question 11

The first in a series of steps to follow when creating a table is to:

A) identify columns that must be unique.
B) identify each attribute and its characteristics.
C) create an index.
D) identify columns that must be null.

Question 12

The ________ is the structure that contains descriptions of objects such as tables and views created by users.

A) SQL
B) schema
C) catalog
D) master view

Question 13

Which of the following is a technique for optimizing the internal performance of the relational data model?

A) Avoiding indexes on secondary keys
B) Clustering data
C) Not reporting statistics to save machine resources
D) Using random index organizations

Question 14

What does the following SQL statement do? Update Product_T
Set Unit_Price = 775
Where Product_ID = 7

A) Changes the price of a unit called Product_T to 7
B) Changes the unit price of Product 7 to 775
C) Changes the length of the Unit_Price field to 775
D) Updates the Product_T table to have a unit price of 775

Question 15

DDL is typically used during which phase of the development process?

A) Implementation
B) Physical design
C) Analysis
D) Evaluation

Question 16

The main concept of relational databases was published in 1970 by:

A) Itzak Ben-Gan.
B) Hoffer.
C) Mills.
D) E.F.Codd.

Question 17

INSERT INTO is an example of ________ code.

A) DDL
B) DML
C) DCL
D) TIO

Question 18

Given a table named store with 5 fields: store_id, address, city, state, zipcode, why would the following insert command not work? insert into store values ('234 Park Street')

A) It would work just fine.
B) You must specify the fields to insert if you are only inserting some of the fields.
C) There is no table keyword.
D) Insert into should be INSERT to.

Question 19

The SQL command ________ adds one or more new columns to a table.

A) create table
B) alter table
C) create view
D) create relationship

Question 20

The command for creating a database is:

A) create table.
B) create view.
C) create schema.
D) create authorization.

Question 21

What does the following SQL statement do? Select * From Customer Where Cust_Type = "Best"

A) Selects all the fields from the Customer table for each row with a customer labeled "Best"
B) Selects the "*" field from the Customer table for each row with a customer labeled "Best"
C) Selects fields with a "*" in them from the Customer table
D) Selects all the fields from the Customer table for each row with a customer labeled "*"

Question 22

What will be returned when the following SQL statement is executed? Select driver_no, count(*) as num_deliveries
From deliveries
Where state = 'MA'
Group by driver_no;

A) A listing of all drivers who made deliveries to state = 'MA', sorted by driver number
B) A listing of each driver who made deliveries to state = 'MA' as well as the number of deliveries that each driver has made to that state
C) A count of all of the deliveries made to state = 'MA' by all drivers
D) An error message will be generated

Question 23

Which of the following will produce the minimum of all standard prices?

A) Select standard_price from Product_V where Standard_Price = min;
B) Select min(standard_price) from Product_V;
C) Select Standard_Price from min(Product_V);
D) Select min(Standard_Price) from Product_V where Standard_Price = min(Standard_Price);

Question 24

Which of the following counts ONLY rows that contain a value?

A) Count
B) Count(*)
C) Tally(*)
D) Checknum

Question 25

What result set will the following query return? Select Item_No, description
From item
Where weight > 100 and weight < 200;

A) The Item_No and description for all items weighing less than 100
B) The Item_No for all items weighing between 101 and 199
C) The Item_No and description for all items weighing between 101 and 199
D) The Item_No for all items weighing more than 200

Question 26

What result set will the following query return? Select Item_No
From Order_V
Where quantity > 10;

A) The Item_No of all orders that had more than 10 items
B) The Order_Id of all orders that had more than one item
C) The Order_Id of all orders that had more than 10 items
D) The Item_No of all orders that had 10 or more items

Question 27

To get all the customers from Hawaii sorted together, which of the following would be used?

A) Order By
B) Group By
C) Having
D) Sort

Question 28

What result set is returned from the following query? Select Customer_Name, telephone
From customers
Where city in ('Boston','New York','Denver');

A) The Customer_Name and telephone of all customers
B) The Customer_Name and telephone of all customers living in either Boston, New York or Denver
C) The Customer_Name and telephone of all customers living in Boston and New York and Denver
D) The Customer_Name of all customers living in Boston, New York or Denver

Question 29

Which of the following is the wildcard operator in SQL statements?

A) < >
B) *
C) =
D) &

Question 30

The first part of an SQL query to be read is the ________ statement.

A) SELECT
B) FROM
C) WHERE
D) ORDER BY

Question 31

A single value returned from an SQL query that includes an aggregate function is called a(n):

A) agate.
B) scalar aggregate.
C) vector aggregate.
D) summation.

Question 32

Which of the following questions is answered by the SQL statement? Select Count (Product_Description) from Product_T;

A) How many products are in the table Product_T?
B) How many products have product descriptions in the Product Table?
C) How many characters are in the field name "Product_Description"?
D) How many different columns named "Product_Description" are there in table Product_T?

Question 33

What will result from the following SQL Select statement? Select min(Product_Description)
From Product_V;

A) The minimum value of Product_Description will be displayed.
B) An error message will be generated.
C) The first product description alphabetically in Product_V will be shown.
D) SELECT @ will be displayed.

Question 34

The last part of an SQL query to be read is the ________ statement.

A) SELECT
B) FROM
C) WHERE
D) ORDER BY

Question 35

Multiple values returned from an SQL query that includes an aggregate function are called:

A) vector aggregates.
B) scalar aggregates.
C) agates.
D) summations.

Question 36

To eliminate duplicate rows in a query, the ________ qualifier is used in the SQL Select command.

A) alter
B) distinct
C) check
D) specific

Question 37

What will be returned when the following SQL statement is executed? Select driver_no,count(*) as num_deliveries
From deliveries
Group by driver_no;

A) A listing of all drivers, sorted by driver number
B) A listing of each driver as well as the number of deliveries that he or she has made
C) A count of all of the deliveries made by all drivers
D) An error message

Question 38

Which of the following can produce scalar and vector aggregates?

A) Order By
B) Group By
C) Having
D) Sort

Question 39

What result will the following SQL statement produce? Select Avg(standard_price) as average from Product_V;

A) The average of all products in Product_V
B) The average Standard_Price of all products in Product_V
C) The average price of all products
D) The mode of all prices

Question 40

What results will be produced by the following SQL query? Select sum(standard_price) as Total_Price
From Product_V
Where Product_Type = 'WOOD';

A) The total price of all products that are of type wood
B) The total price of all products
C) The Standard_Price of the first wood product in the table
D) The Standard_Price of any wood product in the table

Question 41

A database is maintained and queried using the data mapping language (DML).

Question 42

A ________ view is materialized when referenced.

A) virtual
B) dynamic
C) materialized
D) base

Question 43

Materialized views are stored on disk and are never refreshed.

Question 44

A view may not be updated directly if it contains:

A) the SELECT clause.
B) the HAVING clause.
C) the FROM clause.
D) the WHERE clause.

Question 45

A catalog is the structure that contains object descriptions created by a user.

Question 46

The benefits of a standardized relational language include:

A) application turnover.
B) increased training costs.
C) cross-system communication.
D) confusing the SQL programmers.

Question 47

Referential Integrity Constraints are generally established between:

A) Referential and Integrity keys.
B) Primary and Secondary keys.
C) Primary and Foreign keys.
D) Foreign and Domestic keys.

Question 48

A database table is defined using the data definition language (DDL).

Question 49

Requiring a CustomerID to exist in a Primary table before it can exist in a foreign table is an example of:

A) Referential Referring.
B) Referential Integrity.
C) Ethical Integrity.
D) the Hoffer Principle.

Question 50

Which of the following is a purpose of the SQL standard?

A) To specify syntax and semantics of SQL data definition and manipulation
B) To specify maximum and incomplete standards
C) To define every operation for every SQL database
D) To permit no degrees of freedom for SQL DBMS

Question 51

DCL is used to update the database with new records.

Question 52

Which of the following finds all groups meeting stated conditions?

A) Select
B) Where
C) Having
D) Find

Question 53

The CREATE SCHEMA DDL command is used to create a table.

Question 54

SQL is both an American and international standard for database access.

Question 55

What will be returned when the following SQL query is executed? Select driver_no, count(*) as num_deliveries
From deliveries
Group by driver_no
Having count(*) > 2;

A) A listing of all drivers who made more than 2 deliveries as well as a count of the number of deliveries
B) A listing of all drivers
C) A listing of the number of deliveries greater than 2
D) A listing of all drivers who made more than 2 deliveries

Question 56

SQL has been implemented only in the mainframe and midrange environments.

Question 57

The content of dynamic views is generated when they are referenced.

Question 58

The views are created by executing a CREATE VIEW SQL command.

Question 59

Which of the following is true of the order in which SQL statements are evaluated?

A) The SELECT clause is always processed first.
B) The SELECT clause is always processed last.
C) The SELECT clause is processed before the ORDER BY clause.
D) The GROUP BY clause is processed before the WHERE clause.

Question 60

When the SELECT clause in the create view statement contains the keyword DISTINCT, the view can be used to update data.

Question 61

An insert command does not need to have the fields listed.

Question 62

Applications can be moved from one machine to another when each machine uses SQL.

Question 63

Indexes generally slow down access speed in most RDMS.

Question 64

The ALTER TABLE command is used to change a table definition.

Question 65

In databases, null values are equivalent to zero.

Question 66

A major benefit of SQL as a standard is reduced training costs.

Question 67

The comparison operators = and != are used to establish a range of values.

Question 68

Implementation of a standard can never stifle creativity and innovation.

Question 69

Count(*) tallies only those rows that contain a value, while Count counts all rows.

Question 70

The following insert command would work fine:
insert into budget values 121,222,111;

Question 71

SQL originated from a project called System-S.

Question 72

The asterisk (*) wildcard designator can be used to select all fields from a table as well as in WHERE clauses when an exact match is not possible.

Question 73

In order to update data in SQL, one must inform the DBMS which relation, columns, and rows are involved.

Question 74

The DELETE TABLE DDL command is used to remove a table from the database.

Question 75

Some DBMS can handle graphic data types as well as text and numbers.

Question 76

When creating tables, it's important to decide which columns will allow null values before the table is created.

Question 77

Expressions are mathematical manipulations of data in a table that may be included as part of the SELECT statement.

Question 78

The SQL command used to populate tables is the INSERT command.

Question 79

One of the original purposes of the SQL standard was to provide a vehicle for portability of database definition and application modules between conforming DBMSs.

Question 80

The DROP command deletes rows from a table individually or in groups.