Ma’lumotlar tahlili yo‘nalishi bo‘yicha o‘qituvchilar uchun qo‘llanma

1-yechim:

SELECT distinct email,firstname,lastname,e.name

FROM Customer a,Invoice b,InvoiceLine c,Track d,Genre e

WHERE a.Customerid=b.Customerid AND b.Invoiceid=c.Invoiceid

AND c.Trackid=d.Trackid AND d.Genreid=e.Genreid AND e.name = 'Rock' ORDER BY email;

2-yechim:

SELECT Customer.Email, Customer.FirstName, Customer.LastName, Genre.Name

FROM Customer

INNER JOIN Invoice ON Customer.CustomerId=Invoice.CustomerId

INNER JOIN InvoiceLine ON Invoice.InvoiceId=InvoiceLine.InvoiceId

INNER JOIN Track ON InvoiceLine.TrackId=Track.TrackId

INNER JOIN Genre ON Genre.GenreId=Track.GenreId

WHERE Genre.Name="Rock"

GROUP BY Customer.CustomerId

ORDER BY Customer.Email