Memilih nilai antara dua kolom dalam beberapa baris

Saya harus mengubah pemicu Anda, karena tidak menerima pengiriman atau baris ketiga

Seperti yang Anda lihat

Anda dapat mengakses semua yang baru dengan menggunakan NEW.product_id tidak perlu memilih sama sekali

Hal berikutnya yang perlu saya ubah adalah saya sekarang tidak punya id lagi jadi saya menggunakan NEW.product:id lagi.

Skema (MySQL v5.7)

CREATE TABLE `product` (
  `product_id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  `product` varchar(100) NOT NULL,
  `total_quantity` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `range_and_prices` (
  `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  `ranges_from` int(11) NOT NULL,
  `ranges_to` int(11) NOT NULL,
  `prices` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `range` (
  `product_id` INT NOT NULL PRIMARY KEY,
  `range_prices` int(11)  NULL,
  FOREIGN KEY (`product_id`) REFERENCES `product`(`product_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO `range_and_prices` (`ranges_from`,`ranges_to`, `prices`) VALUES
('1','20', 10),
('21','40', 20),
('41','60', 40);

CREATE TRIGGER `range_on_product`
AFTER insert ON `product`
FOR EACH ROW
insert into `range`(`product_id`, `range_prices`) VALUES 
(NEW.product_id , (SELECT DISTINCT prices FROM range_and_prices WHERE (SELECT total_quantity FROM product WHERE product_id=NEW.product_id) BETWEEN ranges_from AND ranges_to ORDER BY prices ASC
LIMIT 1 ) );

INSERT INTO `product` ( `product`, `total_quantity`) VALUES ("Coffee", "5"),("sugar", "25"); 

Kueri #1

SELECT * FROM `range_and_prices`;

| id  | ranges_from | ranges_to | prices |
| --- | ----------- | --------- | ------ |
| 1   | 1           | 20        | 10     |
| 2   | 21          | 40        | 20     |
| 3   | 41          | 60        | 40     |

Kueri #2

SELECT * FROM `product`;

| product_id | product | total_quantity |
| ---------- | ------- | -------------- |
| 1          | Coffee  | 5              |
| 2          | sugar   | 25             |

Kueri #3

SELECT * FROM `product` INNER JOIN `range` ON product.product_id=range.product_id;

| product_id | product | total_quantity | product_id | range_prices |
| ---------- | ------- | -------------- | ---------- | ------------ |
| 1          | Coffee  | 5              | 1          | 10           |
| 2          | sugar   | 25             | 2          | 20           |

Lihat di DB Fiddle