单选题
The CUSTOMERS table has these columns: ![]()
Which statement finds the rows in the CUSTOMERS table that do not have a postal code?（）
发布日期：2022-07-04
A
SELECT customer_id, customer_name FROM customers WHERE postal_code CONTAINS NULL;
B
SELECT customer_id, customer_name FROM customers WHERE 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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