Oracle Database SQL 12c 1z0-071 Exam Practice Test 1

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SELECT COUNT (DISTINCT list_price) FROM product_information WHERE list_price is NULL
SELECT COUNT (NVL(list_price, 0)) FROM product_information WHERE list_price is NULL
SELECT COUNT (list_price) FROM product_information WHERE list_price i= NULL
SELECT COUNT (list_price) FROM product_information WHERE list_price is NULL

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