#	exclusive	inclusive	rows x	rows	loops	node
1.	6.047	9.879	↓ 1.0	4704	1	→ Merge Left Join (cost=16.65..834.08 rows=4664 width=779) (actual time=0.168..9.879 rows=4704 loops=1) Merge Cond: (kp.id = purchase_order.project_id)
2.	0.136	0.177	↑ 1.0	218	1	→ Sort (cost=16.65..17.19 rows=218 width=224) (actual time=0.147..0.177 rows=218 loops=1) Sort Key: kp.id Sort Method: quicksort Memory: 83kB
3.	0.041	0.041	↑ 1.0	218	1	→ Seq Scan on kdvn_project kp (cost=0.00..8.18 rows=218 width=224) (actual time=0.006..0.041 rows=218 loops=1)
4.	1.386	3.655	↑ 1.0	4664	1	→ Materialize (cost=0.00..758.04 rows=4664 width=555) (actual time=0.014..3.655 rows=4664 loops=1)
5.	2.269	2.269	↑ 1.0	4664	1	→ Index Scan using project_id on purchase_order (cost=0.00..699.74 rows=4664 width=555) (actual time=0.012..2.269 rows=4664 loops=1)

"Merge Left Join  (cost=16.65..834.08 rows=4664 width=779) (actual time=0.168..9.879 rows=4704 loops=1)"
"  Merge Cond: (kp.id = purchase_order.project_id)"
"  ->  Sort  (cost=16.65..17.19 rows=218 width=224) (actual time=0.147..0.177 rows=218 loops=1)"
"        Sort Key: kp.id"
"        Sort Method: quicksort  Memory: 83kB"
"        ->  Seq Scan on kdvn_project kp  (cost=0.00..8.18 rows=218 width=224) (actual time=0.006..0.041 rows=218 loops=1)"
"  ->  Materialize  (cost=0.00..758.04 rows=4664 width=555) (actual time=0.014..3.655 rows=4664 loops=1)"
"        ->  Index Scan using project_id on purchase_order  (cost=0.00..699.74 rows=4664 width=555) (actual time=0.012..2.269 rows=4664 loops=1)"
"Total runtime: 11.360 ms"

Per node type stats

node type	count	sum of times	% of query
Index Scan	1	2.269 ms	23.0 %
Materialize	1	1.386 ms	14.0 %
Merge Left Join	1	6.047 ms	61.2 %
Seq Scan	1	0.041 ms	0.4 %
Sort	1	0.136 ms	1.4 %

Per table stats

Table name	Scan count	Total time	% of query
scan type	count	sum of times	% of table
kdvn_project	1	0.041 ms	0.4 %
Seq Scan	1	0.041 ms	100.0 %
purchase_order	1	2.269 ms	23.0 %
Index Scan	1	2.269 ms	100.0 %

explain.depesz.com

A tool for finding a real cause for slow queries.

Result: Wca

Colorize:

Columns visibility:

Per node type stats

Per table stats