多选题
The CUSTOMERS table has these columns: 
The CUSTOMER_ID column is the primary key for the table.Which two statements find the number of customers? （）
发布日期：2021-01-28
SELECT TOTAL(*) FROM customers;
SELECT COUNT(*) FROM customers;
SELECT TOTAL(customer_id) FROM customers;
SELECT COUNT(customer_id) FROM customers;
SELECT COUNT(customers) FROM customers;
SELECT TOTAL(customer_name) FROM customers;
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The CUSTOMERS table has these columns: CUSTOMER_ID NUMBER(4) NOT NULL CUSTOMER_N...