Explain

EXPLAIN SELECT count(*) FROM users;
 
QUERY PLAN                                                   |
-------------------------------------------------------------+
Aggregate  (cost=19.50..19.51 rows=1 width=8)                |
  ->  Seq Scan on users  (cost=0.00..17.00 rows=1000 width=0)|

EXPLAIN ANALYZE SELECT * FROM users ORDER BY username;
 
QUERY PLAN                                                                                                                       |
---------------------------------------------------------------------------------------------------------------------------------+
Index Scan using people_username_idx on users  (cost=0.28..28.27 rows=1000 width=17) (actual time=0.052..1.494 rows=1000 loops=1)|
Planning Time: 0.186 ms                                                                                                          |
Execution Time: 1.686 ms