


How to create the order details table of the food shopping system in MySQL
When developing the food shopping system, the order details table is a very important data table. It records the product details in each order, including product ID, quantity, price and other information. This article will introduce how to create an order details table for the grocery shopping system in MySQL, and attach specific code examples.
- Create database and data table
First, create a database named buy_vegetables
in MySQL. You can use the following command:
CREATE DATABASE buy_vegetables;
Then, select the database:
USE buy_vegetables;
Next, create the order details table order_items
. The table contains the following fields:
-
id
: order detail ID, which is an auto-incrementing primary key -
order_id
: order ID, and order The order ID in the table is associated with -
product_id
: product ID, which is associated with the product ID in the product table -
quantity
: product quantity -
price
: Product unit price
You can use the following code to create the order_items
table:
CREATE TABLE order_items ( id INT AUTO_INCREMENT PRIMARY KEY, order_id INT, product_id INT, quantity INT, price DECIMAL(10, 2) );
- Add foreign key constraints
To ensure the integrity of the association, foreign key constraints can be added to the order_id
and product_id
fields. First, create the orders
table and the products
table, and then add foreign key constraints respectively.
-
Create the
orders
table, containing the following fields:-
id
: order ID, which is an auto-incrementing primary key -
customer_id
: Customer ID, associated with the customer ID in the customer table -
order_date
: Order date
You can use the following code to create the
orders
table:CREATE TABLE orders ( id INT AUTO_INCREMENT PRIMARY KEY, customer_id INT, order_date DATE );
-
-
Create the
products
table with the following fields:-
id
: Product ID, an auto-incremented primary key -
name
: Product name -
price
: Product price
You can use the following code to create the
products
table:CREATE TABLE products ( id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255), price DECIMAL(10, 2) );
-
-
To add foreign key constraints, use the following code:
ALTER TABLE order_items ADD CONSTRAINT fk_order_items_orders FOREIGN KEY (order_id) REFERENCES orders(id), ADD CONSTRAINT fk_order_items_products FOREIGN KEY (product_id) REFERENCES products(id);
- Inserting data example
In order to demonstrate the usage of the order details table, the following is an example SQL statement example to insert data:
INSERT INTO orders (customer_id, order_date) VALUES (1, '2021-01-01'); INSERT INTO products (name, price) VALUES ('苹果', 5.99), ('橙子', 4.99); INSERT INTO order_items (order_id, product_id, quantity, price) VALUES (1, 1, 2, 11.98), (1, 2, 3, 14.97);
The above code is to# Some sample data is inserted into the ##orders table and the
products table, and order details are inserted into the
order_items table.
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