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9.3.5_sql_stored_views_procedures_functions.sql
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9.3.5_sql_stored_views_procedures_functions.sql
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USE Chinook;
-- 1. Create a view help your colleagues see which countries have the most invoices
CREATE VIEW CountryInvoicesRanked AS
SELECT
BillingCountry AS Country,
COUNT(DISTINCT InvoiceId) AS Invoices,
RANK() OVER (ORDER BY COUNT(DISTINCT InvoiceId) DESC) AS Rank_
FROM
Invoice
GROUP BY BillingCountry
ORDER BY Invoices DESC;
SELECT *
FROM CountryInvoicesRanked;
-- 2. Create a view help your colleagues see which cities have the most valuable customer base
CREATE VIEW CityCustomerSpending AS
SELECT
c.City,
c.Country,
SUM(i.Total) AS TotalSpending,
RANK() OVER (ORDER BY SUM(i.Total) DESC) AS Rank_
FROM
Customer c
JOIN Invoice i USING(CustomerId)
GROUP BY c.City, c.Country
ORDER BY TotalSpending DESC;
SELECT *
FROM CityCustomerSpending;
-- 3. Create a view to identify the top spending customer in each country. Order the results from highest spent to lowest.
CREATE VIEW TopSpenderByCountry AS
WITH CustomerSpending AS (
SELECT
c.CustomerId,
c.Country,
SUM(i.Total) AS TotalCustomerSpend,
RANK() OVER (PARTITION BY c.Country ORDER BY SUM(i.Total) DESC) AS SpendingRank
FROM Customer c
JOIN Invoice i USING(CustomerId)
GROUP BY c.CustomerId, c.Country
)
SELECT
Country,
TotalCustomerSpend AS HighestCustomerSpend,
CustomerId
FROM CustomerSpending
WHERE SpendingRank <= 1
ORDER BY HighestCustomerSpend DESC;
SELECT *
FROM TopSpenderByCountry;
-- 4. Create a view to show the top 5 selling artists of the top selling genre
-- If there are multiple genres that all sell well, give the top 5 of all top selling genres collectively
CREATE VIEW TopFiveOfTopGenre AS
WITH RankedGenres AS (
SELECT
g.Name AS Genre,
SUM(il.Quantity * t.UnitPrice) AS TotalSales,
RANK() OVER (ORDER BY SUM(il.Quantity * t.UnitPrice) DESC) AS GenreRank
FROM
genre g
JOIN track t USING (GenreId)
JOIN invoiceline il USING (TrackId)
GROUP BY g.GenreId
)
, RankedTracksOfTopGenre AS (
SELECT
g.Name AS Genre,
a.Name AS Artist,
SUM(il.Quantity * t.UnitPrice) AS TotalSales,
RANK() OVER (ORDER BY SUM(il.Quantity * t.UnitPrice) DESC) AS TrackRank
FROM
genre g
JOIN track t USING (GenreId)
JOIN invoiceline il USING (TrackId)
JOIN album al USING (AlbumId)
JOIN artist a USING (ArtistId)
WHERE g.Name IN (SELECT Genre FROM RankedGenres WHERE GenreRank = 1)
GROUP BY g.Name, a.Name
)
SELECT *
FROM RankedTracksOfTopGenre
WHERE TrackRank <= 5;
SELECT *
FROM TopFiveOfTopGenre;
-- 5. Create a stored procedure that, when provided with an InvoiceId,
-- retrieves all orders and corresponding order items acquired by the customer who placed the specified order
DELIMITER $$
CREATE PROCEDURE GetAllCustomerOrders(IN InputInvoiceId INT)
BEGIN
SELECT
i.CustomerId,
i.InvoiceID,
il.TrackId,
ar.Name AS Artist,
t.Name AS Track,
al.Title AS Album,
il.UnitPrice,
il.Quantity
FROM Invoice i
JOIN InvoiceLine il USING (InvoiceId)
JOIN Track t USING (TrackId)
JOIN Album al USING (AlbumId)
JOIN Artist ar USING (ArtistId)
WHERE CustomerId = (SELECT CustomerId
FROM Invoice
WHERE InvoiceId = InputInvoiceId);
END $$
DELIMITER ;
CALL GetAllCustomerOrders(1);
-- 6. Create a stored procedure to retrieve sales data from a given date range
DELIMITER $$
CREATE PROCEDURE GetSalesDataBetweenDates(IN InputStartDate DATE, IN InputEndDate DATE)
BEGIN
SELECT
I.InvoiceId,
I.CustomerId,
I.InvoiceDate,
SUM(il.UnitPrice * il.Quantity) AS TotalSales
FROM
Invoice i
JOIN
InvoiceLine il USING (InvoiceId)
WHERE
i.InvoiceDate BETWEEN InputStartDate AND InputEndDate
GROUP BY
i.InvoiceId;
END $$
DELIMITER ;
CALL GetSalesDataBetweenDates('2022-01-01', '2022-01-31');
-- 7. Create a stored function to calculate the average invoice amount for a given country
DELIMITER $$
CREATE FUNCTION GetAverageInvoiceAmountForCountry(InputCountryName VARCHAR(255))
RETURNS DECIMAL(10, 2)
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE avgAmount DECIMAL(10, 2);
SELECT AVG(Total) INTO avgAmount
FROM Invoice
WHERE BillingCountry = InputCountryName;
RETURN avgAmount;
END $$
DELIMITER ;
SELECT GetAverageInvoiceAmountForCountry('USA');
-- 8. Create a stored function that returns the best-selling artist in a specified genre
DELIMITER $$
CREATE FUNCTION GetBestSellingArtistInGenre(InputGenre VARCHAR(255))
RETURNS VARCHAR(255)
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE TopArtist VARCHAR(255);
WITH RankedGenreArtists AS (
SELECT
ar.Name AS Artist,
COUNT(il.TrackId) AS SoldTrackCount,
RANK() OVER (ORDER BY COUNT(il.TrackId) DESC) AS Rank_
FROM
InvoiceLine il
JOIN Track t USING (TrackId)
JOIN Album al USING (AlbumId)
JOIN Artist ar USING (ArtistId)
JOIN Genre g USING (GenreId)
WHERE g.Name = InputGenre
GROUP BY ar.ArtistId
)
SELECT Artist INTO TopArtist
FROM RankedGenreArtists
WHERE Rank_ = 1;
RETURN TopArtist;
END $$
DELIMITER ;
SELECT GetBestSellingArtistInGenre("Rock");
-- 9. Create a stored function to calculate the total amount that customer spent with the company
DELIMITER $$
CREATE FUNCTION GetTotalSpend(InputCustomerId INT)
RETURNS DECIMAL(10, 2)
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE SumTotal DECIMAL(10, 2);
SELECT SUM(Total) INTO SumTotal
FROM Invoice
WHERE CustomerId = InputCustomerId;
RETURN SumTotal;
END $$
DELIMITER ;
SELECT GetTotalSpend(1);
-- 10. Create a stored function to find the average song length for an album
DELIMITER $$
CREATE FUNCTION GetAverageTrackLength(InputAlbumId INT)
RETURNS FLOAT
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE AvgTrackLength FLOAT;
SELECT AVG(t.MilliSeconds) INTO AvgTrackLength
FROM Track t
JOIN Album al USING (AlbumId)
WHERE al.AlbumId = InputAlbumId;
RETURN AvgTrackLength;
END $$
DELIMITER ;
SELECT GetAverageTrackLength(1);
-- 11. Create a stored function to return the most popular genre for a given country
DELIMITER $$
CREATE FUNCTION GetTopGenre(InputCountry VARCHAR(255))
RETURNS VARCHAR(255)
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE TopGenre VARCHAR(255);
WITH RankedGenresOfCountry AS (
SELECT
g.Name AS Genre,
COUNT(il.TrackId) AS TotalTracksSold,
RANK() OVER (ORDER BY COUNT(il.TrackId) DESC) AS Rank_
FROM Invoice i
JOIN InvoiceLine il USING (InvoiceId)
JOIN Track t USING (TrackId)
JOIN Genre g USING (GenreId)
WHERE BillingCountry = InputCountry
GROUP BY g.GenreId, g.Name
)
SELECT Genre INTO TopGenre
FROM RankedGenresOfCountry
WHERE Rank_ = 1;
RETURN TopGenre;
END $$
DELIMITER ;
SELECT GetTopGenre("USA");