phpmyadmin 版本 4：关系视图有时不显示外键约束

PHPMyAdmin 4版本中关系视图外键约束显示问题解析

sql
CREATE TABLE example_table (
    id INT PRIMARY KEY,
    other_id INT,
    FOREIGN KEY (other_id) REFERENCES other_table(id)
) ENGINE=InnoDB;

sql
-- 创建主表
CREATE TABLE users (
    user_id INT PRIMARY KEY,
    username VARCHAR(255)
) ENGINE=InnoDB;
-- 创建相关联的从表，包含外键约束
CREATE TABLE orders (
    order_id INT PRIMARY KEY,
    user_id INT,
    order_date DATE,
    FOREIGN KEY (user_id) REFERENCES users(user_id)
) ENGINE=InnoDB;