How to show these Data also woth details

In my ionic2 app i have to show same list filtered by date.Data is coming from firebase.

Here in users node i can show all the user information using angularfirelist.what i need is how to link data in attendance with userss node.
Do i need to dupplicate all the data in USERSS to Attendance again??

in users node it includes all the data and attendance includes same users but filtered by the date.

Can anyone save my day please???

thank You