How to create and maintain a database with

SQL

Exercises

$1.$ Write a script that adds an index to the MyGuitarShop database for the zip code

field in the Addresses

table.

$2.$ Write a script that implements the following design to create a database named

MyWebDB:

Include a statement to drop the MyWebDB database if it already exists.

Include statements to create and select the MyWebDB database.

In the Downloads table, the UserID and ProductID columns are foreign keys.

Choose appropriate data types for each column in the tables. $($Hint: Use the int,

varchar, and

datetime$2$ data types.$)$

Define the EmailAddress and ProductName columns so that each value must be

unique.

In the Users table, the EmailAddress and LastName columns are required, but the

FirstName column

is not.

Include any indexes that you think are necessary.

$3.$ Write a script that adds rows to the database that you created in STEP $2.$

Add two rows to the Users table and two rows to the Products table. You can

choose any names you

like or use names that return the same results as in the example table below.

Add three rows to the Downloads table: one row for user $1$ and product $1$; one for

user $2$ and product

$1$; and one for user $2$ and product $2.$ Use the GETDATE function to insert the current

date and time

into the DownloadDate column.

Write a SELECT statement that joins the three tables and retrieves the data from

these tables like this:

Sort the results by the email address in descending order and the product name in

ascending order.

$4.$ Write a script that uses ALTER TABLE statements to add the following new

columns to the Products

table created in STEP $2$:

Add one column for product price that provides for up to three digits to the left of the

decimal point

and two to the right. This column should have a default value of $9\mathrm{.}99.$

Add one column for the date and time that the product was added to the database.

$5.$ Write a script that uses an ALTER TABLE statement to modify the Users table

created in STEP $2$

so the FirstName column cannot store null values and can store a maximum of $20$

characters.

In the same script, code an UPDATE statement that attempts to insert a row with a

null value in the FirstName column. It should fail due to the new not null constraint.

Code another UPDATE statement that attempts to insert a first name that$$s longer

than $20$ characters.

It should fail due to the length of the column