发布日期:2020-04-10
A.SELECT customer_id, customer_name FROM customers WHERE postal_code CONTAINS NULL;
B.SELECT customer_id, customer_name FROM customers WHER postal_code = ' ___________';
C.SELECT customer_id, customer_name FROM customers WHERE postal _ code IS NULL;
D.SELECT customer_id, customer_name FROM customers WHERE postal code IS NVL;
E.SELECT customer_id, customer_name FROM customers WHERE postal_code = NULL;
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