CREATE TABLE PlaylistTrack (PlaylistId INT, TrackId INT)
CREATE TABLE MediaType (MediaTypeId INT, Name VARCHAR)
CREATE TABLE InvoiceLine (InvoiceLineId INT, InvoiceId INT, TrackId INT, UnitPrice DECIMAL, Quantity INT)
CREATE TABLE Track (TrackId INT, Name VARCHAR, AlbumId INT, MediaTypeId INT, GenreId INT, Composer VARCHAR, Milliseconds INT, Bytes INT, UnitPrice DECIMAL)
CREATE TABLE Genre (GenreId INT, Name VARCHAR)
CREATE TABLE Invoice (InvoiceId INT, CustomerId INT, InvoiceDate DATETIME, BillingAddress VARCHAR, BillingCity VARCHAR, BillingState VARCHAR, BillingCountry VARCHAR, BillingPostalCode VARCHAR, Total DECIMAL)
CREATE TABLE Employee (EmployeeId INT, LastName VARCHAR, FirstName VARCHAR, Title VARCHAR, ReportsTo INT, BirthDate DATETIME, HireDate DATETIME, Address VARCHAR, City VARCHAR, State VARCHAR, Country VARCHAR, PostalCode VARCHAR, Phone VARCHAR, Fax VARCHAR, Email VARCHAR)
CREATE TABLE Customer (CustomerId INT, FirstName VARCHAR, LastName VARCHAR, Company VARCHAR, Address VARCHAR, City VARCHAR, State VARCHAR, Country VARCHAR, PostalCode VARCHAR, Phone VARCHAR, Fax VARCHAR, Email VARCHAR, SupportRepId INT)
CREATE TABLE Playlist (PlaylistId INT, Name VARCHAR)
CREATE TABLE Album (AlbumId INT, Title VARCHAR, ArtistId INT)
CREATE TABLE Artist (ArtistId INT, Name VARCHAR)

What are the first names and support rep ids for employees serving 10 or more customers. Visualize by pie chart.
SELECT T1.FirstName, T1.SupportRepId FROM Customer AS T1 JOIN Employee AS T2 ON T1.SupportRepId = T2.EmployeeId
SELECT "T1"."FirstName", "T1"."SupportRepId" FROM "Customer" AS "T1" JOIN "Employee" AS "T2" ON "T1"."SupportRepId" = "T2"."EmployeeId"