Merge pull request #2 from JMR-dev/jr-interludebranch

jr interludebranch

.gitignore

@@ -1 +1 @@
-projectnotes.md*
+projectnotes.md

invoice_totals.sql

@@ -0,0 +1,10 @@
+SELECT 
+    INVOICE.Total, CUSTOMER.FirstName, CUSTOMER.LastName, EMPLOYEE.FirstName, Employee.LastName, Invoice.BillingCountry
+FROM
+    ((Customer
+INNER JOIN
+    Employee ON Employee.EmployeeId = Customer.SupportRepId)
+INNER JOIN
+    INVOICE ON INVOICE.CustomerId = Customer.CustomerId)
+ORDER BY 
+    INVOICE.Total DESC;

project_notes.md

@@ -1,31 +0,0 @@
-# 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)
-

total_invoices_{year}.sql

@@ -0,0 +1,6 @@
+SELECT strftime('%Y', InvoiceDate) as Year,
+    COUNT(*) as InvoiceCount
+FROM Invoice
+WHERE strftime('%Y', InvoiceDate) = '2009'
+    OR strftime('%Y', InvoiceDate) = '2011'
+GROUP BY strftime('%Y', InvoiceDate);