add scripts

Author: jpomfret

Scripts/01-01.sql

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+-- Create a list of employees and their immediate managers.
+
+SELECT emp.firstName, emp.lastName, emp.title, mng.firstName AS ManagerFirstName, mng.lastName AS ManagerLastName
+FROM employee emp
+INNER JOIN employee mng
+    ON emp.managerId = mng.employeeId
+

Scripts/01-02.sql

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+-- Find sales people who have zero sales
+
+SELECT emp.firstName, emp.lastName, emp.title, emp.startDate, sls.salesId
+FROM employee emp
+LEFT JOIN sales sls
+    on emp.employeeId = sls.employeeId
+WHERE emp.title = 'Sales Person'
+AND sls.salesId IS NULL;

Scripts/01-03.sql

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+-- List all customers & their sales, even if some data is gone
+
+-- FULL OUTER JOIN NOT SUPPORTED
+
+SELECT *
+FROM customer c
+INNER JOIN sales s
+    ON c.customerId = s.customerId
+UNION
+-- UNION WITH CUSTOMERS WHO HAVE NO SALES
+SELECT *
+FROM customer c
+LEFT JOIN sales s
+    ON c.customerId = s.customerId
+WHERE s.salesId IS NULL;

Scripts/02-01.sql

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+-- How many cars has been sold per employee
+
+SELECT e.employeeId, e.firstName, e.lastName, count(*) as NumOfCarsSold
+FROM sales s
+INNER JOIN employee e
+    on s.employeeId = e.employeeId
+GROUP BY e.employeeId, e.firstName, e.lastName;

Scripts/02-02.sql

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+-- Find the least and most expensive car sold by each employee
+
+SELECT e.employeeId, e.firstName, e.lastName, count(*) as NumOfCarsSold, min(salesAmount) as MinSalesAmount, max(salesAmount) as MaxSalesAmount
+FROM sales s
+INNER JOIN employee e
+    on s.employeeId = e.employeeId
+GROUP BY e.employeeId, e.firstName, e.lastName

Scripts/02-03.sql

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+-- Display report for employees who have sold at least 10 cars
+
+SELECT e.employeeId, count(*) as NumOfCarsSold, min(salesAmount) as MinSalesAmount, max(salesAmount) as MaxSalesAmount
+FROM sales s
+INNER JOIN employee e
+    on s.employeeId = e.employeeId
+GROUP BY e.employeeId
+HAVING count(*) > 10
+
+-- note about not being able to reference NumOfCarsSold for having

Scripts/03-01.sql

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+-- Summarise sales per year by using a CTE
+

Scripts/03-02.sql

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+-- Display cars sold for each employee by month
+

Scripts/03-03.sql

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+-- Find sales of cars which are electric by using a subquery

Scripts/04-01.sql

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+-- For each sales person rank the car models they've sold most