Starting from question 10 The image is a database schema diagram for a music-related database, featuring several tables and their relationships. Here's a detailed transcription and explanation:### Tables and Their Relationships:1. **Playlists** - **PlaylistId** (INTEGER) - **Name** (NVARCHAR(120))2. **PlaylistTrack** - **PlaylistId** (INTEGER) - **TrackId** (INTEGER)3. **Tracks** - **TrackId** (INTEGER) - **Name** (NVARCHAR(200)) - **AlbumId** (INTEGER) - **MediaTypeId** (INTEGER) - **GenreId** (INTEGER) - **Composer** (NVARCHAR(220)) - **Milliseconds** (INTEGER) - **Bytes** (INTEGER) - **UnitPrice** (NUMERIC)4. **Media Types** - **MediaTypeId** (INTEGER) - **Name** (NVARCHAR(120))5. **Genres** - **GenreId** (INTEGER) - **Name** (NVARCHAR(120))6. **Artists** - **ArtistId** (INTEGER) - **Name** (NVARCHAR(120))7. **Invoices** - **InvoiceId** (INTEGER) - **CustomerId** (INTEGER) - **InvoiceDate** (DATETIME) - **BillingAddress** (NVARCHAR) - **BillingCity** (NVARCHAR) - **4 more columns...**8. **Invoice Items** - **InvoiceItemId** (INTEGER) - **InvoiceId** (INTEGER) - **TrackId** (INTEGER) - **UnitPrice** (NUMERIC) - **Quantity** (INTEGER)9. **Albums** - **AlbumId** (INTEGER) - **Title** (NVARCHAR(160)) - **ArtistId** (INTEGER)10. **Customers** - **CustomerId** (INTEGER) - **FirstName** (NVARCHAR(40)) - **LastName** (NVARCHAR(20)) - **Company** (NVARCHAR(80)) - **Address** (NVARCHAR(70)) - **City** (NVARCHAR(40)) - **Country** (NVARCHAR 40) - **PostalCode** (NVARCHAR(10)) - **Phone** (NVARCHAR( **Educational Website Content**---### Database Concepts and SQL Queries#### Question 14*How many records are created when you apply a Cartesian join (Cross join) to the invoice and invoice items table?*#### Question 1*The following diagram is a depiction of what type of join?*![Venn Diagram](image-link)- **Diagram Explanation**: The Venn diagram shown depicts two overlapping circles labeled as "table1" and "table2". The overlapping region is shaded and represents the records retrieved by this type of join.- **Options**: a. Inner Join b. Full outer join c. Left join d. Right join #### Question 16*Select which of the following statements are true regarding inner joins. (Select all that apply)*- **Options**: a. There is no limit to the number of tables you can join with an inner join. b. Performance will most likely worsen with the more joins you make. c. Inner joins retrieve all matching and nonmatching rows from a table. d. Inner joins are one of the most popular types of joins used. #### Question 17*Which of the following is true regarding Aliases? (Select all that apply.)*- **Options**: a. Aliases are often used to make column names more readable. b. SQL aliases are used to give a table, or a column in a table, a temporary name. c. An alias only exists for the duration of the query. #### Question 18*What is wrong with the following query?*```sqlSELECT Customers.CustomerName, Orders.OrderIDFROM LEFT JOIN ON Customers.CustomerID = Orders.CustomerID FROM Orders AND CustomersORDER BY CustomerName;```#### Question 19*Write a query to find the total number of invoices for each customer along with the customer's full name, city, and email.*#### Question 20*Write a query to retrieve the track name, album, artistID, and trackID for all the albums.*---This content provides an overview of database concepts with a focus on SQL joins, queries, and aliases. It includes visual aids and exercises designed to deepen understanding through practical application.

Solution: 10. How many albums does the artist Led Zeppelin have? SQL Query: select count(*) from…

10. Write a SQL code to find how many albums does the artist Led Zeppelin have. 11. Create a list of album titles and the unit prices for the artist "Audioslave". 12. Find the first and last name of any customer who does not have an invoice. Are there any customers returned from the query? 13. Find the total price for each album.

10. Write a SQL code to find how many albums does the artist Led Zeppelin have. 11. Create a list of album titles and the unit prices for the artist "Audioslave". 12. Find the first and last name of any customer who does not have an invoice. Are there any customers returned from the query? 13. Find the total price for each album.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

SQL

SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.

Question

Starting from question 10

The image is a database schema diagram for a music-related database, featuring several tables and their relationships. Here's a detailed transcription and explanation:

### Tables and Their Relationships:

1. **Playlists**
- **PlaylistId** (INTEGER)
- **Name** (NVARCHAR(120))

2. **PlaylistTrack**
- **PlaylistId** (INTEGER)
- **TrackId** (INTEGER)

3. **Tracks**
- **TrackId** (INTEGER)
- **Name** (NVARCHAR(200))
- **AlbumId** (INTEGER)
- **MediaTypeId** (INTEGER)
- **GenreId** (INTEGER)
- **Composer** (NVARCHAR(220))
- **Milliseconds** (INTEGER)
- **Bytes** (INTEGER)
- **UnitPrice** (NUMERIC)

4. **Media Types**
- **MediaTypeId** (INTEGER)
- **Name** (NVARCHAR(120))

5. **Genres**
- **GenreId** (INTEGER)
- **Name** (NVARCHAR(120))

6. **Artists**
- **ArtistId** (INTEGER)
- **Name** (NVARCHAR(120))

7. **Invoices**
- **InvoiceId** (INTEGER)
- **CustomerId** (INTEGER)
- **InvoiceDate** (DATETIME)
- **BillingAddress** (NVARCHAR)
- **BillingCity** (NVARCHAR)
- **4 more columns...**

8. **Invoice Items**
- **InvoiceItemId** (INTEGER)
- **InvoiceId** (INTEGER)
- **TrackId** (INTEGER)
- **UnitPrice** (NUMERIC)
- **Quantity** (INTEGER)

9. **Albums**
- **AlbumId** (INTEGER)
- **Title** (NVARCHAR(160))
- **ArtistId** (INTEGER)

10. **Customers**
- **CustomerId** (INTEGER)
- **FirstName** (NVARCHAR(40))
- **LastName** (NVARCHAR(20))
- **Company** (NVARCHAR(80))
- **Address** (NVARCHAR(70))
- **City** (NVARCHAR(40))
- **Country** (NVARCHAR 40)
- **PostalCode** (NVARCHAR(10))
- **Phone** (NVARCHAR(

**Educational Website Content**

---

### Database Concepts and SQL Queries

#### Question 14
*How many records are created when you apply a Cartesian join (Cross join) to the invoice and invoice items table?*

#### Question 1
*The following diagram is a depiction of what type of join?*

![Venn Diagram](image-link)

- **Diagram Explanation**: The Venn diagram shown depicts two overlapping circles labeled as "table1" and "table2". The overlapping region is shaded and represents the records retrieved by this type of join.

- **Options**:
a. Inner Join
b. Full outer join
c. Left join
d. Right join

#### Question 16
*Select which of the following statements are true regarding inner joins. (Select all that apply)*

- **Options**:
a. There is no limit to the number of tables you can join with an inner join.
b. Performance will most likely worsen with the more joins you make.
c. Inner joins retrieve all matching and nonmatching rows from a table.
d. Inner joins are one of the most popular types of joins used.

#### Question 17
*Which of the following is true regarding Aliases? (Select all that apply.)*

- **Options**:
a. Aliases are often used to make column names more readable.
b. SQL aliases are used to give a table, or a column in a table, a temporary name.
c. An alias only exists for the duration of the query.

#### Question 18
*What is wrong with the following query?*

```sql
SELECT Customers.CustomerName, Orders.OrderID
FROM LEFT JOIN ON Customers.CustomerID = Orders.CustomerID FROM Orders AND Customers
ORDER BY CustomerName;
```

#### Question 19
*Write a query to find the total number of invoices for each customer along with the customer's full name, city, and email.*

#### Question 20
*Write a query to retrieve the track name, album, artistID, and trackID for all the albums.*

---

This content provides an overview of database concepts with a focus on SQL joins, queries, and aliases. It includes visual aids and exercises designed to deepen understanding through practical application.

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