Merge pull request #1 from JMR-dev/jr-interludebranch

Completed through question 8

.gitignore

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+projectnotes.md*

brazil_customers.sql

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+SELECT FirstName, LastName, Country FROM CUSTOMER
+WHERE Country = 'Brazil';

brazil_customers_invoices.sql

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+SELECT  
+     Customer.FirstName, Customer.LastName, Invoice.InvoiceId, Invoice.InvoiceDate, Invoice.BillingCountry
+FROM
+    Invoice
+INNER JOIN
+     Customer
+ON
+     Invoice.CustomerId = Customer.CustomerId
+WHERE
+     Invoice.BillingCountry = 'Brazil'
+ORDER BY
+     LastName ASC;

non_usa_customers.sql

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+SELECT CustomerId, FirstName, Country FROM CUSTOMER
+WHERE COUNTRY != 'USA';

project_notes.md

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+# Project Notes - SQL Interlude - Chinook
+
+## Questions
+### How to use NOT in queries
+Why does
+
+```
+SELECT * FROM CUSTOMER
+WHERE COUNTRY NOT LIKE 'USA';
+```
+
+work and
+
+```
+SELECT * FROM CUSTOMER
+WHERE COUNTRY NOT 'USA';
+```
+does not work?
+
+### Answer
+To avoid using `LIKE` <br/>
+
+`WHERE NOT customer.country = "USA";` <br/>
+or <br/>
+`WHERE NOT != "USA";` <br/>
+
+are valid ways of forming the query.
+
+## Resources
+[How to concatenate columns in SQL - CONCAT_WS()](https://www.w3schools.com/sql/func_mysql_concat_ws.asp)
+

sales_agent_invoices.sql

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+SELECT 
+    EMPLOYEE.FirstName, EMPLOYEE.LastName, InvoiceId
+FROM
+    Employee
+INNER JOIN
+    INVOICE
+ON
+    CUSTOMER.CustomerId = INVOICE.CustomerId
+INNER JOIN
+    Customer
+ON
+    Customer.SupportRepId = Employee.EmployeeId
+ORDER BY
+    InvoiceId ASC;

sales_agents.sql

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+SELECT DISTINCT
+    EMPLOYEE.FirstName, EMPLOYEE.LastName 
+FROM 
+    EMPLOYEE
+INNER JOIN
+    Customer
+ON
+    EMPLOYEE.EmployeeId = Customer.SupportRepId;

unique_invoice_countries.sql

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+SELECT DISTINCT
+    BillingCountry
+FROM 
+    INVOICE;
+