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Use MySQL to create a membership level table to implement the membership level function
Use MySQL to create a membership level table to implement the membership level function
Use MySQL to create a membership level table to implement the membership level function
Overview:
In the membership management system, membership level is a very important function. Depending on the membership level, different rights and benefits can be granted, as well as different points exchange ratios, etc. This article will introduce how to use MySQL to create a membership level table and implement the membership level function through code examples.
Create a membership level table:
First, we need to create a membership level table to store different levels of membership information. You can use the following SQL statement to create a table named "member_level", including membership level ID, level name, discount ratio and other fields:
CREATE TABLE member_level (
id INT PRIMARY KEY,
name VARCHAR(50) NOT NULL,
discount DECIMAL(3,2) NOT NULL
);
In the above SQL statement, we defined three fields, namely "id" (member Level ID), "name" (level name) and "discount" (discount ratio). Among them, the "id" field is the primary key, and the "name" and "discount" fields cannot be empty.
Insert membership level data:
Next, we need to insert some initial data into the membership level table. You can use the following SQL statement to insert data for four membership levels:
INSERT INTO member_level (id, name, discount)
VALUES (1, 'Ordinary member', 1),
(2, '铜牌会员', 0.9), (3, '银牌会员', 0.8), (4, '金牌会员', 0.7);
In the above SQL statement, we inserted four records into the member_level table, representing ordinary members, bronze members, silver members and gold members respectively. Each membership level has a different discount ratio, which is used to calculate the price after enjoying the membership discount.
Query member level information:
In actual use, we often need to perform different business logic processing according to the member's level. The following is an example of querying member level information through member level ID:
SELECT * FROM member_level WHERE id = 2;
The above SQL statement will return the member level information with id 2, which is bronze medal Member information. We can do further processing in the code based on the query results, such as calculating the discounted price based on the discount ratio.
Update membership level information:
Sometimes, we need to update the data in the membership level table, such as updating the discount ratio of the membership level. The following is an example of updating the membership level discount ratio:
UPDATE member_level SET discount = 0.85 WHERE id = 2;
The above SQL statement will update the discount ratio for bronze members to 0.85. We can use the new discount ratio for calculations in subsequent codes.
Summary:
By using MySQL to create a membership level table and implementing different membership level functions based on membership level information in the code, we can add more flexibility and scalability to the membership management system. . Through the above code examples, you can better understand how to use MySQL to create a membership level table, and how to use membership level information in the code for business logic processing. Hope this article helps you!
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