Question: This image shows a toy invoice database. Assume these are the data from entities in a Toy Invoice Database. This database has the following tables.

This image shows a toy invoice database.
Assume these are the data from entities in a Toy Invoice Database. This database has the following tables.
Products: The attributes are ProductNumber, ProductName, and ItemPrice
Invoices: The attributes are Invoice and DateSold
Vendors: The attributes are VendorNumber and Vendor
Orders: The attributes are Invoice, VendorNumber, ProductNumber, and QtySold
Answer the following questions regarding keys, data integrity, and relationships that would need to be established.
For table INVOICES, identify the primary key. Select None If the table does not have a primary key.
Group of answer choices
Invoice
None
DateSold

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