MySQL 5.7 create VIEW or FUNCTION or PROCEDURE

1.视图
a.
CREATE
    ALGORITHM = UNDEFINED
    DEFINER = `root`@`localhost`
    SQL SECURITY INVOKER
VIEW `sakila`.`actor_info` AS
    SELECT
        `a`.`actor_id` AS `actor_id`,
        `a`.`first_name` AS `first_name`,
        `a`.`last_name` AS `last_name`,
        GROUP_CONCAT(DISTINCT CONCAT(`c`.`name`,
                    ‘: ‘,
                    (SELECT
                            GROUP_CONCAT(`f`.`title`
                                    ORDER BY `f`.`title` ASC
                                    SEPARATOR ‘, ‘)
                        FROM
                            ((`sakila`.`film` `f`
                            JOIN `sakila`.`film_category` `fc` ON ((`f`.`film_id` = `fc`.`film_id`)))
                            JOIN `sakila`.`film_actor` `fa` ON ((`f`.`film_id` = `fa`.`film_id`)))
                        WHERE
                            ((`fc`.`category_id` = `c`.`category_id`)
                                AND (`fa`.`actor_id` = `a`.`actor_id`))))
            ORDER BY `c`.`name` ASC
            SEPARATOR ‘; ‘) AS `film_info`
    FROM
        (((`sakila`.`actor` `a`
        LEFT JOIN `sakila`.`film_actor` `fa` ON ((`a`.`actor_id` = `fa`.`actor_id`)))
        LEFT JOIN `sakila`.`film_category` `fc` ON ((`fa`.`film_id` = `fc`.`film_id`)))
        LEFT JOIN `sakila`.`category` `c` ON ((`fc`.`category_id` = `c`.`category_id`)))
GROUP BY `a`.`actor_id` , `a`.`first_name` , `a`.`last_name`

b.

CREATE
    ALGORITHM = UNDEFINED
    DEFINER = `root`@`localhost`
    SQL SECURITY DEFINER
VIEW `sakila`.`staff_list` AS
    SELECT
        `s`.`staff_id` AS `ID`,
        CONCAT(`s`.`first_name`,
                _UTF8‘ ‘,
                `s`.`last_name`) AS `name`,
        `a`.`address` AS `address`,
        `a`.`postal_code` AS `zip code`,
        `a`.`phone` AS `phone`,
        `sakila`.`city`.`city` AS `city`,
        `sakila`.`country`.`country` AS `country`,
        `s`.`store_id` AS `SID`
    FROM
        (((`sakila`.`staff` `s`
        JOIN `sakila`.`address` `a` ON ((`s`.`address_id` = `a`.`address_id`)))
        JOIN `sakila`.`city` ON ((`a`.`city_id` = `sakila`.`city`.`city_id`)))
        JOIN `sakila`.`country` ON ((`sakila`.`city`.`country_id` = `sakila`.`country`.`country_id`)))

2.存储过程
a.
CREATE DEFINER=`root`@`localhost` PROCEDURE `film_in_stock`(IN p_film_id INT, IN p_store_id INT, OUT p_film_count INT)
    READS SQL DATA
BEGIN
     SELECT inventory_id
     FROM inventory
     WHERE film_id = p_film_id
     AND store_id = p_store_id
     AND inventory_in_stock(inventory_id);

     SELECT FOUND_ROWS() INTO p_film_count;
END

b.
CREATE DEFINER=`root`@`localhost` PROCEDURE `rewards_report`(
    IN min_monthly_purchases TINYINT UNSIGNED
    , IN min_dollar_amount_purchased DECIMAL(10,2) UNSIGNED
    , OUT count_rewardees INT
)
    READS SQL DATA
    COMMENT ‘Provides a customizable report on best customers‘
proc: BEGIN

    DECLARE last_month_start DATE;
    DECLARE last_month_end DATE;

    /* Some sanity checks... */
    IF min_monthly_purchases = 0 THEN
        SELECT ‘Minimum monthly purchases parameter must be > 0‘;
        LEAVE proc;
    END IF;
    IF min_dollar_amount_purchased = 0.00 THEN
        SELECT ‘Minimum monthly dollar amount purchased parameter must be > $0.00‘;
        LEAVE proc;
    END IF;

    /* Determine start and end time periods */
    SET last_month_start = DATE_SUB(CURRENT_DATE(), INTERVAL 1 MONTH);
    SET last_month_start = STR_TO_DATE(CONCAT(YEAR(last_month_start),‘-‘,MONTH(last_month_start),‘-01‘),‘%Y-%m-%d‘);
    SET last_month_end = LAST_DAY(last_month_start);

    /*
        Create a temporary storage area for
        Customer IDs.
    */
    CREATE TEMPORARY TABLE tmpCustomer (customer_id SMALLINT UNSIGNED NOT NULL PRIMARY KEY);

    /*
        Find all customers meeting the
        monthly purchase requirements
    */
    INSERT INTO tmpCustomer (customer_id)
    SELECT p.customer_id
    FROM payment AS p
    WHERE DATE(p.payment_date) BETWEEN last_month_start AND last_month_end
    GROUP BY customer_id
    HAVING SUM(p.amount) > min_dollar_amount_purchased
    AND COUNT(customer_id) > min_monthly_purchases;

    /* Populate OUT parameter with count of found customers */
    SELECT COUNT(*) FROM tmpCustomer INTO count_rewardees;

    /*
        Output ALL customer information of matching rewardees.
        Customize output as needed.
    */
    SELECT c.*
    FROM tmpCustomer AS t
    INNER JOIN customer AS c ON t.customer_id = c.customer_id;

    /* Clean up */
    DROP TABLE tmpCustomer;
END

3.函数
a.
CREATE DEFINER=`root`@`localhost` FUNCTION `get_customer_balance`(p_customer_id INT, p_effective_date DATETIME) RETURNS decimal(5,2)
    READS SQL DATA
    DETERMINISTIC
BEGIN

       #OK, WE NEED TO CALCULATE THE CURRENT BALANCE GIVEN A CUSTOMER_ID AND A DATE
       #THAT WE WANT THE BALANCE TO BE EFFECTIVE FOR. THE BALANCE IS:
       #   1) RENTAL FEES FOR ALL PREVIOUS RENTALS
       #   2) ONE DOLLAR FOR EVERY DAY THE PREVIOUS RENTALS ARE OVERDUE
       #   3) IF A FILM IS MORE THAN RENTAL_DURATION * 2 OVERDUE, CHARGE THE REPLACEMENT_COST
       #   4) SUBTRACT ALL PAYMENTS MADE BEFORE THE DATE SPECIFIED

  DECLARE v_rentfees DECIMAL(5,2); #FEES PAID TO RENT THE VIDEOS INITIALLY
  DECLARE v_overfees INTEGER;      #LATE FEES FOR PRIOR RENTALS
  DECLARE v_payments DECIMAL(5,2); #SUM OF PAYMENTS MADE PREVIOUSLY

  SELECT IFNULL(SUM(film.rental_rate),0) INTO v_rentfees
    FROM film, inventory, rental
    WHERE film.film_id = inventory.film_id
      AND inventory.inventory_id = rental.inventory_id
      AND rental.rental_date <= p_effective_date
      AND rental.customer_id = p_customer_id;

  SELECT IFNULL(SUM(IF((TO_DAYS(rental.return_date) - TO_DAYS(rental.rental_date)) > film.rental_duration,
        ((TO_DAYS(rental.return_date) - TO_DAYS(rental.rental_date)) - film.rental_duration),0)),0) INTO v_overfees
    FROM rental, inventory, film
    WHERE film.film_id = inventory.film_id
      AND inventory.inventory_id = rental.inventory_id
      AND rental.rental_date <= p_effective_date
      AND rental.customer_id = p_customer_id;

  SELECT IFNULL(SUM(payment.amount),0) INTO v_payments
    FROM payment

    WHERE payment.payment_date <= p_effective_date
    AND payment.customer_id = p_customer_id;

  RETURN v_rentfees + v_overfees - v_payments;
END

b.
CREATE DEFINER=`root`@`localhost` FUNCTION `inventory_in_stock`(p_inventory_id INT) RETURNS tinyint(1)
    READS SQL DATA
BEGIN
    DECLARE v_rentals INT;
    DECLARE v_out     INT;

    #AN ITEM IS IN-STOCK IF THERE ARE EITHER NO ROWS IN THE rental TABLE
    #FOR THE ITEM OR ALL ROWS HAVE return_date POPULATED

    SELECT COUNT(*) INTO v_rentals
    FROM rental
    WHERE inventory_id = p_inventory_id;

    IF v_rentals = 0 THEN
      RETURN TRUE;
    END IF;

    SELECT COUNT(rental_id) INTO v_out
    FROM inventory LEFT JOIN rental USING(inventory_id)
    WHERE inventory.inventory_id = p_inventory_id
    AND rental.return_date IS NULL;

    IF v_out > 0 THEN
      RETURN FALSE;
    ELSE
      RETURN TRUE;
    END IF;
END