I need help with questions 18,19,and 20 14. How many records are created when you apply a Cartesian join (Cross join) to the invoice andinvoice items table?1. The following diagram is a depiction of what type of join?a.Inner Joinb. Full outer joinC. Left joind. Right join16. Select which of the following statements are true regarding inner joins. (Select all that apply)a. There is no limit to the number of table you can join with an inner join.b.Performance will most likely worsen with the more joins you makeInner joins retrieve all matching and nonmatching rows from a tabled. Inner joins are one of the most popular types of joins use17. Which of the following is true regarding Aliases? (Select all that apply.)a. Aliases are often used to make column names more readableb.SQL aliases are used to give a table, or a column in a table, a temporary name.An alias only exists for the duration of the query.18. What is wrong with the following query?SELECT Customers.CustomerName, Orders.OrderIDFROM LEFT JOIN ON Customers.CustomerID = Orders.CustomerID FROM Orders AND CustomersORDER BYCustomerName;19. Write a query to find the total number of invoices for each customer along with the customer's fullname, city and email.20. Write a query to retrieve the track name, album, artistID, and trackID for all the albums.C.table1C.table2

To create a program that executes the corrected SQL query and fetches the desired results, you can follow these general steps:Choose a programming language: Select a programming language that supports database connectivity and has appropriate libraries or modules for executing SQL queries. Common choices include Python, Java, C#, and PHP.Set up the database connection: Install the necessary libraries or modules to connect to your database. These could include drivers or connectors specific to your database system (e.g., MySQL, PostgreSQL, SQLite).Establish the database connection: Use the provided credentials (username, password, host, port) to establish a connection to the database.Write the SQL query: Implement the corrected SQL query within your program. Make sure to use the appropriate syntax for the selected programming language to execute the query.Execute the query: Use the established database connection to execute the SQL query and retrieve the results. This typically involves invoking a method or function provided by the database library or module.Process the results: Retrieve the fetched results from the executed query and process them as needed. This might involve iterating over the result set, extracting specific columns or values, performing calculations, or formatting the output.Display or use the results: Present the processed results to the user or use them for further computations within your program, depending on the specific requirements.Handle errors: Implement appropriate error handling to catch and handle any potential errors that might occur during the execution of the program, such as database connection issues or syntax errors in the query.Clean up: Close the database connection and release any allocated resources once you have finished executing the query and processing the results.Test and refine: Run the program, validate the output, and make any necessary refinements or enhancements based on your testing results.Answer :1SELECT Customers.CustomerName, Orders.OrderID 2FROM Customers 3LEFT JOIN Orders ON Customers.CustomerID = Orders.CustomerID 4ORDER BY Customers.CustomerName ASCExplanation :There are a few issues with the provided query:Syntax error: The syntax of the query is incorrect. The correct syntax for a SELECT statement is: SELECT column1, column2, ... FROM table1 JOIN table2 ON condition WHERE condition ORDER BY columnIncorrect table aliases: The table aliases "Customers" and "Orders" are separated by a space, which is not valid syntax. You should remove the space between the table aliases.Incorrect join syntax: The "LEFT JOIN" statement is missing the "ON" keyword and the condition for joining the tables. Additionally, the "FROM" keyword is used multiple times in the query.Typo in column selection: There is an extra space between "Customers." and "CustomerName" in the SELECT clause. Remove the space to correct it.Incorrect ORDER BY syntax: The colon (":") is used instead of the "ASC" or "DESC" keywords to specify the sorting order.The provided query has multiple issues with its syntax and structure. The corrected query selects the "CustomerName" column from the "Customers" table and the "OrderID" column from the "Orders" table, joins them on the "CustomerID" column using a left join, and orders the results by the "CustomerName" column in ascending order.

Answered: 18. What is wrong with the following…

Engineering

Computer Science

18. What is wrong with the following query? SELECT Customers. CustomerName, Orders. OrderID FROM LEFT JOIN ON Customers.CustomerID = Orders.CustomerID FROM Orders AND Customers ORDER BY CustomerName;

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

I need help with questions 18,19,and 20

14. How many records are created when you apply a Cartesian join (Cross join) to the invoice and
invoice items table?
1. The following diagram is a depiction of what type of join?
a.
Inner Join
b. Full outer join
C. Left join
d. Right join
16. Select which of the following statements are true regarding inner joins. (Select all that apply)
a. There is no limit to the number of table you can join with an inner join.
b.
Performance will most likely worsen with the more joins you make
Inner joins retrieve all matching and nonmatching rows from a table
d. Inner joins are one of the most popular types of joins use
17. Which of the following is true regarding Aliases? (Select all that apply.)
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.
An alias only exists for the duration of the query.
18. What is wrong with the following query?
SELECT Customers.CustomerName, Orders.OrderID
FROM LEFT JOIN ON Customers.CustomerID = Orders.CustomerID FROM Orders AND Customers
ORDER BY
CustomerName;
19. Write a query to find the total number of invoices for each customer along with the customer's full
name, city and email.
20. Write a query to retrieve the track name, album, artistID, and trackID for all the albums.
C.
table1
C.
table2

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