@mydb1 | .user, .address | join( .user.uid == .address.uid) | .email, .username, .country;
@mydb1 | .user, .address | join( .uid ) | .user.uid, .username, .country;
@mydb1 | .user | .[1];
@mydb1 | .user | .[0:2];
@mydb1 | .user | .[:3];
@mydb1 | .user | .[2:];
@mydb1 | .user | .[];
@mydb1 | .user | .uid, .username;
@mydb1.user | .uid, .username;