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You have been given two tables, CUSTOMER and SALE. You want to check the referential integrity constraint: SALE.CustomerNumber must exist in CUSTOMER.CustomerNumber You

You have been given two tables, CUSTOMER and SALE. You want to check the referential integrity constraint:

SALE.CustomerNumber must exist in CUSTOMER.CustomerNumber

You run the following SQL query:

SELECT CustomerNumber

FROM SALE

WHERE CustomerNumber NOT IN

(SELECT CustomerNumber

FROM CUSTOMER);

What is shown in the results of this query?

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