what is these codes insert into

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CREATE TABLE [Car] ( [CarID] varchar(30), [SerialNumber] varchar(50), [Model] varchar(30), [Colour] varchar(30), [Year] varchar(20), PRIMARY KEY ([CarID]) );

CREATE TABLE [ServiceTicket] ( [ServiceticketID] varchar(40), [Serviceticketnumber] varchar(40), [CarID] varchar(30), [CustomerID] int, [Datarecieved] varchar(30), [Comments] varchar(100), [Datareturnedcustomer] varchar(100), PRIMARY KEY ([ServiceticketID]), CONSTRAINT [FK_ServiceTicket.CustomerID] FOREIGN KEY ([CustomerID]) REFERENCES [Customer]([CustomerID]), CONSTRAINT [FK_ServiceTicket.CarID] FOREIGN KEY ([CarID]) REFERENCES [Car]([CarID]) );

CREATE TABLE [ServiceMechanic] ( [ServicemechanicID] varchar(40), [ServiceticketID] varchar(40), [ServiceID] int, [MechanicID] int, [Hours] varchar(10), [Comment] varchar(100), [Rate] varchar(40), PRIMARY KEY ([ServicemechanicID]), CONSTRAINT [FK_ServiceMechanic.MechanicID] FOREIGN KEY ([MechanicID]) REFERENCES [Mechanic]([MechanicID]), CONSTRAINT [FK_ServiceMechanic.ServiceID] FOREIGN KEY ([ServiceID]) REFERENCES [Service]([ServiceID]), CONSTRAINT [FK_ServiceMechanic.ServiceticketID] FOREIGN KEY ([ServiceticketID]) REFERENCES [ServiceTicket]([ServiceticketID]) );

CREATE TABLE [Parts] ( [PartID] varchar(30), [Partnumber] varchar(30), [Descrition] varchar(100), [Purchaseprice] varchar(80), [Retailprice] varchar(30), PRIMARY KEY ([PartID]) );

CREATE TABLE [PartUsed] ( [PartusedID] int identity(1,1), [PartID] varchar(30), [ServiceticketID] varchar(40), [Number used] varchar(40), [Price] varchar(30), PRIMARY KEY ([PartusedID]), CONSTRAINT [FK_PartUsed.ServiceticketID] FOREIGN KEY ([ServiceticketID]) REFERENCES [ServiceTicket]([ServiceticketID]), CONSTRAINT [FK_PartUsed.PartusedID] FOREIGN KEY ([PartID]) REFERENCES [Parts]([PartID]) );

CREATE TABLE [SalesInvoice] ( [InvoiceID] int identity(1,1), [Invoicenumber] varchar(30), [Date] varchar(30), [CarID] varchar(30), [CustomerID] int, [SalespersonID] int, PRIMARY KEY ([InvoiceID]), CONSTRAINT [FK_SalesInvoice.CustomerID] FOREIGN KEY ([CustomerID]) REFERENCES [Customer]([CustomerID]), CONSTRAINT [FK_SalesInvoice.CarID] FOREIGN KEY ([SalesPersonID]) REFERENCES [SalesPerson]([SalesPersonID]) );