Test question classification management method in MySQL table structure design of online examination system

Test question classification management method in the MySQL table structure design of the online examination system

When designing the MySQL table structure of the online examination system, test question classification management is an important link. The rational design of test question classification can improve the maintainability and scalability of the system and facilitate administrators to manage test questions. This article will introduce a table structure design method based on MySQL and give specific code examples.

1. Requirements Analysis
In the online examination system, test questions are one of the core contents of the system. In order to facilitate examination administrators to manage examination questions, examination questions need to be classified. Taking into account the hierarchical nature and flexibility of test question classification, we will adopt a multi-level classification design.

2. Table structure design
Based on the results of demand analysis, we designed the following tables to manage test question classification:

1. category (test question classification table)
   Fields:
2. category_id: category ID, primary key;
3. name: category name;
4. parent_id: parent category ID, used to implement multi-level classification.

Table structure example:

CREATE TABLE `category` (
  `category_id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) NOT NULL,
  `parent_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`category_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2. question (question table)
   Field:
3. question_id: question ID, primary key;
4. content: test question content;
5. category_id: category ID, foreign key.

Table structure example:

CREATE TABLE `question` (
  `question_id` int(11) NOT NULL AUTO_INCREMENT,
  `content` varchar(500) NOT NULL,
  `category_id` int(11) NOT NULL,
  PRIMARY KEY (`question_id`),
  CONSTRAINT `fk_question_category` FOREIGN KEY (`category_id`) REFERENCES `category` (`category_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

3. Code example
The following are some common operation examples used to manage test question classification:

1. Query all categories

   SELECT * FROM category;

2. Query all subcategories under a certain category

   SELECT * FROM category WHERE parent_id = {parent_id};

3. Query all subcategories under a certain category Test questions

   SELECT question.* FROM question
   INNER JOIN category ON question.category_id = category.category_id
   WHERE category.category_id = {category_id};

   4. Summary
   Through the introduction of the test question classification management method in the MySQL table structure design of the online examination system, we can see that through reasonable table structure design and code implementation, which can realize flexible management of test question classification. This design method based on multi-level classification can meet the needs of test question classification at different levels and depths, and facilitates examination administrators to manage test questions.

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