Master

Scripts/ali-haider-01.sql

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+select sql FROM sqlite_schema where name = "employee";
+
+select * from model m order by m.modelId desc LIMIT 10;
+
+SELECT * FROM employee e LIMIT 10;
+SELECT count(e.employeeId) FROM employee e;
+
+SELECT * FROM employee e LIMIT 10;
+SELECT * FROM sales s LIMIT 10;
+SELECT * FROM customer c LIMIT 10;
+SELECT * FROM model m LIMIT 10;
+SELECT * FROM inventory i LIMIT 10;

Scripts/p00-start.sql

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+select e.firstName, e.lastName, e.title, m.firstName as 'Manager First Name', m.lastName as 'Manager Last Name'
+from employee e
+INNER JOIN employee m
+ON e.managerId = m.employeeId;

Scripts/p01-joins.sql

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+select e.firstName, e.lastName, e.title, m.firstName as 'Manager First Name', 
+m.lastName as 'Manager Last Name'
+FROM employee e
+INNER JOIN employee m
+ON e.managerId = m.employeeId;
+
+SELECT * FROM employee;

Scripts/p02-joins.sql

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+select * from sales limit 10;
+
+select e.firstName, e.lastName, count(s.salesId) as 'totalSales'
+from employee e
+LEFT JOIN sales s ON s.employeeId = e.employeeId
+where e.title = 'Sales Person'
+group BY e.employeeId
+having totalSales = 0
+order by totalSales DESC;

Scripts/p03-joins.sql

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+select * from customer;
+select * from sales limit 10;
+
+SELECT c.firstName, c.lastName, c.email, s.salesAmount, s.soldDate
+FROM customer c
+INNER JOIN sales s ON s.customerId = c.customerId
+UNION
+SELECT c.firstName, c.lastName, c.email, s.salesAmount, s.soldDate
+FROM customer c
+LEFT JOIN sales s ON s.customerId = c.customerId
+WHERE s.salesId is null
+UNION
+SELECT c.firstName, c.lastName, c.email, s.salesAmount, s.soldDate
+FROM sales s
+LEFT JOIN customer c ON s.customerId = c.customerId
+WHERE c.customerId is null;

Scripts/p04-grouping.sql

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+select e.employeeId, e.firstName, e.lastName, count(s.salesId) as 'totalSales' 
+from sales s
+INNER join employee e on e.employeeId = s.employeeId
+group by s.employeeId, e.firstName, e.lastName
+order by totalSales desc;

Scripts/p05-grouping.sql

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+
+  select s.employeeId, e.firstName, e.lastName, MAX(s.salesAmount) as 'saleAmount'
+  from sales s
+  inner join employee e on e.employeeId = s.employeeId
+  group by s.employeeId
+  UNION
+  select s.employeeId, e.firstName, e.lastName, MIN(s.salesAmount) as 'saleAmount'
+  from sales s
+  inner join employee e on e.employeeId = s.employeeId
+  group by s.employeeId
+  order by saleAmount desc;
+
+  select s.employeeId, e.firstName, e.lastName,
+  MAX(s.salesAmount) as 'highestSale', MIN(s.salesAmount) as 'lowestAmount'
+  from sales s
+  inner join employee e on e.employeeId = s.employeeId
+  where s.soldDate >= date('now', 'start of year')
+  group by s.employeeId;

Scripts/p06-grouping.sql

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+select e.employeeId, e.firstName, e.lastName, count(s.salesId) as 'totalSales'
+from employee e
+INNER JOIN sales s ON e.employeeId = s.salesId
+GROUP by s.employeeId 
+having totalSales >= 5
+order by totalSales desc;

Scripts/p07-advanced.sql

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+select * from sales s limit 10;
+
+WITH cte AS (
+  SELECT strftime('%Y', s.soldDate) AS 'soldYear', s.salesAmount FROM sales s)
+SELECT soldYear, FORMAT("$%.2f", SUM(salesAmount)) as 'AnnualSale'
+FROM cte 
+GROUP BY soldYear
+ORDER BY soldYear;

Scripts/p08-advanced.sql

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+select * from sales s limit 10;
+
+
+WITH cte AS (
+SELECT s.salesId, s.employeeId, s.soldDate, strftime('%m', s.soldDate) as 'sellingMonth' 
+from sales s 
+WHERE s.soldDate BETWEEN date('2021-01-01') and date('2021-12-31'))
+SELECT c.employeeId, e.firstName, e.lastName, c.sellingMonth, count(c.salesId) as 'totalSales21'
+from cte c
+INNER JOIN employee e on e.employeeId = c.employeeId
+GROUP BY c.employeeId
+ORDER by sellingMonth asc, totalSales21 desc
+;

Scripts/p09-windows function.sql

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+select e.firstName, e.lastName, e.title, s.salesAmount, m.model, 
+  count(m.model) AS 'totalSold', 
+  rank() OVER (PARTITION BY s.employeeId ORDER BY count(m.model) DESC) AS rank
+  from employee e
+  INNER JOIN sales s ON s.employeeId = e.employeeId
+  INNER JOIN inventory i ON i.inventoryId = s.inventoryId
+  INNER JOIN model m ON m.modelId = i.modelId
+  GROUP BY e.firstName, e.lastName, m.model;

Scripts/p10-windows function.sql

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+WITH CTE AS (select strftime('%Y', s.soldDate) AS soldYear, 
+  strftime('%m', s.soldDate) AS soldMonth, SUM(s.salesAmount) as totalSales 
+  from sales s
+  GROUP BY soldYear, soldMonth
+  ORDER BY soldYear, soldMonth)
+
+  SELECT soldYear, soldMonth, totalSales, 
+  SUM(totalSales) 
+  OVER (PARTITION BY soldYear ORDER BY soldYear, soldMonth) 
+  as annualSales 
+  from CTE
+  ;

Scripts/p11-windows function.sql

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+select strftime('%Y-%m', s.soldDate) as soldMonth,
+  COUNT(s.salesId) as carsSold,
+  LAG (count(s.salesId), 1, 0) OVER calMonth as carsSoldLastMonth
+  from sales s
+  GROUP BY soldMonth
+  WINDOW calMonth AS (ORDER BY strftime('%Y-%m', s.soldDate));