Computers and Technology, 04.08.2021 15:50 nostalgiafaith

1. Write an ALTER TABLE statement that adds two new check constraints to the Invoices table of the AP schema. The first should allow (1) payment_date to be null only if payment_total is zero and (2) payment_date to be not null only if payment_total is greater than zero. The second constraint should prevent the sum of payment_total and credit_total from being greater than invoice_total.

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1. Write an ALTER TABLE statement that adds two new check constraints to the Invoices table of the A...