أول Query والمفتاح

import { useQuery } from "@tanstack/react-query";function getStudents() {  return fetch("/api/students").then((res) => res.json());}function StudentsList() {  const { data, isPending, isError, error } = useQuery({    queryKey: ["students"],    queryFn: getStudents,  });  if (isPending) return <p>جاري التحميل...</p>;  if (isError) return <p>خطأ: {error.message}</p>;  return (    <ul>      {data.map((s) => (        <li key={s.id}>{s.name}</li>      ))}    </ul>  );}

useQuery({  queryKey: ["student", studentId],  queryFn: () => getStudent(studentId),});