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Сколько индексов будет создано в результате последовательного выполнения следующих команд:
CREATE TABLE customers
(
customer_id INTEGER PRIMARY KEY,
cust_first_name VARCHAR(20) NOT NULL,
cust_last_name VARCHAR(20) NOT NULL,
cust_street_address VARCHAR(60) NULL,
cust_city VARCHAR(30) NULL,
cust_state VARCHAR(2) NULL,
cust_postal_code VARCHAR(10) NULL,
cust_email VARCHAR(30) NULL,
phone_number VARCHAR(25) NULL UNIQUE,
credit_limit INTEGER NULL
);
CREATE INDEX cust_name
ON customers (cust_last_name, cust_first_name)
Введите число индексов:
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