Answer the following question by executing SQL statements:

Question 5:

Show the number of customers assigned to each of the employees.

Question 6:

From the invoices, show which country's customers spent the most on the tracks.

Question 7:

Show the top 3 artists based on their track sales.

Question 8:

Show the track name names, album name, artist name and genre of all the artist whose names contains last letter from your artist name.

Artist Album 3.00 MediaType B 100-MediaTypeid Name Artistid Name Albumid Title Artistid Track 3-02 TrackId Name Albumid MediaTypeId Genreid Composer Milliseconds 00 Bytes UnitPrice Genre Playlist 1000 Genreid -3-00 PlaylistTrack Playlistid TrackId 7 Playlistid Name Name InvoiceLine 3 InvoiceLineId Invoiceld Trackid UnitPrice Quantity 002 Employee Employeeld LastName FirstName Title Reports To BirthDate HireDate Address City State Country PostalCode Phone Fax Email Customer Customerid FirstName LastName Company Address City State Country PostalCode Phone Fax Email SupportRepid 3-001 Invoice Invoiceld Customerid InvoiceDate BillingAddress Billing City BillingState Billing Country BillingPostalCode Total