163.View the Exhibit and examine the description for the CUSTOMERS table.
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163.View the Exhibit and examine the description for the CUSTOMERS table.
You want to update the CUST_CREDIT_LIMIT column to NULL for all the customers, where
CUST_INCOME_LEVEL has NULL in the CUSTOMERS table. Which SQL statement will accomplish the
SET cust_credit_limit = NULL
WHERE CUST_INCOME_LEVEL = NULL;
B.UPDATE customers
SET cust_credit_limit = NULL
WHERE cust_income_level IS NULL;
C.UPDATE customers
SET cust_credit_limit = TO_NUMBER(NULL)
WHERE cust_income_level = TO_NUMBER(NULL);
D.UPDATE customers
SET cust_credit_limit = TO_NUMBER(' ',9999)
WHERE cust_income_level IS NULL;
答案：B
解析：null不能呢个通过=来判断，排除A，C,D的to_number语法不正确
You want to update the CUST_CREDIT_LIMIT column to NULL for all the customers, where
CUST_INCOME_LEVEL has NULL in the CUSTOMERS table. Which SQL statement will accomplish the
task?
SET cust_credit_limit = NULL
WHERE CUST_INCOME_LEVEL = NULL;
B.UPDATE customers
SET cust_credit_limit = NULL
WHERE cust_income_level IS NULL;
C.UPDATE customers
SET cust_credit_limit = TO_NUMBER(NULL)
WHERE cust_income_level = TO_NUMBER(NULL);
D.UPDATE customers
SET cust_credit_limit = TO_NUMBER(' ',9999)
WHERE cust_income_level IS NULL;
答案：B
解析：null不能呢个通过=来判断，排除A，C,D的to_number语法不正确
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