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SQL . Why won't this work? Write a SELECT statement that determines whether the PaymentDate column of the Invoices table has any invalid values. To

SQL. Why won't this work?
Write a SELECT statement that determines whether the PaymentDate column
of the Invoices table has any invalid values. To be valid, PaymentDate must be
a null value if there's a balance due and a non-null value if there's no balance
due. Code a compound condition in the WHERE clause that tests for these
conditions.
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