Facebook 等网站使用什么格式来存储个人资料数据

JSon
{
  "user_id": "123456789",
  "name": "John Doe",
  "emAIl": "john.doe@example.com",
  "birthday": "1990-01-01",
  "friends": [
    {
      "friend_id": "987654321",
      "friend_name": "Jane Smith"
    },
    {
      "friend_id": "456789012",
      "friend_name": "Bob Johnson"
    }
  ],
  "posts": [
    {
      "post_id": "789012345",
      "content": "Had a great weekend getaway!"
    },
    {
      "post_id": "567890123",
      "content": "Excited about the new project at work!"
    }
  ]
}

sql
CREATE TABLE users (
  user_id INT PRIMARY KEY,
  name VARCHAR(255),
  emAIl VARCHAR(255),
  birthday DATE
);
CREATE TABLE friends (
  user_id INT,
  friend_id INT,
  friend_name VARCHAR(255),
  PRIMARY KEY (user_id, friend_id),
  FOREIGN KEY (user_id) REFERENCES users(user_id)
);
CREATE TABLE posts (
  user_id INT,
  post_id INT PRIMARY KEY,
  content TEXT,
  FOREIGN KEY (user_id) REFERENCES users(user_id)
);