Index Only Scan using z_pkey on z (cost=0.29..8.31 rows=1 width=4) (actual time=0.003..0.004 rows=1 loops=1)
Index Cond: (id = 1)
Heap Fetches: 1
Buffers: shared hit=3
Planning Time: 0.012 ms
Execution Time: 0.008 ms
Index Only Scan using z_pkey on z (cost=0.29..8.31 rows=1 width=4) (actual time=0.003..0.004 rows=1 loops=1)
Index Cond: (id = 1)
Heap Fetches: 1
Buffers: shared hit=3
Planning Time: 0.012 ms
Execution Time: 0.008 ms