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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;

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;

Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter13: Views
Section: Chapter Questions
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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
Transcribed Image Text: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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