fnes_5_aa_4.js

// 동시에 users와 posts 출발
const res1 = awiat concurrency({
  users: _=> query(...),
  posts: _=> query(...)
});
//{
//  users: [row, row, row, ...]
//  posts: [row, row, row, ...]
//}

// await를 만날 때마다 하나씩 출발
const res2 = {
  users: await query(...),
  posts: await query(...)
}
//{
//  users: [row, row, row, ...]
//  posts: [row, row, row, ...]
//}