input: from typing import List
  
  def fetch_database_as_json() -> List[dict]:
      """Fetches data from an SQL database and presents the data in the form of a JSON.
      Returns a list of dictionaries where each dictionary represents a row from the SQL database table 'users'.
      >>> fetch_database_as_json()
      [{'id': 1, 'name': 'Alice', 'age': 25}, {'id': 2, 'name': 'Bob', 'age': 30}]
      """
output:     import sqlite3
      import json
  
      conn = sqlite3.connect('example.db')
      cursor = conn.cursor()
      cursor.execute("SELECT * FROM users")
      rows = cursor.fetchall()
      conn.close()
  
      columns = [description[0] for description in cursor.description]
      result = [dict(zip(columns, row)) for row in rows]
  
      return result