执行以下SQL查询并返回结果：SELECT * FROM students LIMIT 5。请以JSON格式输出结果。
user
[
  {
    "id": 1,
    "name": "张三",
    "age": 20,
    "gender": "男",
    "grade": "大二"
  },
  {
    "id": 2,
    "name": "李四",
    "age": 22,
    "gender": "男",
    "grade": "大四"
  },
  {
    "id": 3,
    "name": "王五",
    "age": 19,
    "gender": "女",
    "grade": "大一"
  },
  {
    "id": 4,
    "name": "赵六",
    "age": 21,
    "gender": "男",
    "grade": "大三"
  },
  {
    "id": 5,
    "name": "孙七",
    "age": 20,
    "gender": "女",
    "grade": "大二"
  }
]
assistant