I have the below query which is taking 1873 ms. How can I improve this? explain analyze select sum(coalesce(price_cents, 0)::bigint * coalesce(quantity, 0) * (1 - coalesce(workitems.discount, 0)/ 100)) as total_budget_cents, sum(coalesce(price_cents, 0)::bigint * coalesce(quantity, 0) * (1 - coalesce(workitems.discount, 0)/ 100) + coalesce(additional_cost_cents, 0) - coalesce(cost_reduction_cents, 0)) as final_budget_cents, projects.id as project_id from projects left join workitems on workitems.project_id = projects.id where workitems.deleted_at is null group by order by project_id asc And explain output is: Sort (cost=62851.33..62856.07 rows=1897 width=35) (actual time=1872.867..1873.003 rows=1229 loops=1) Sort Key: projects.id Sort Method: quicksort Memory: 145kB -> HashAggregate (cost=62719.59..62748.04 rows=1897 width=35) (actual time=1871.281..1872.104 rows=1229 loops=1) Group Key: projects.id -> Hash Right Join (cost=159.68..45386.32 rows=364911 width=35) (actual time=2.226..637.936 rows=365784 loops=1) Hash Cond: (workitems.project_id = projects.id) Filter: (workitems.deleted_at IS NULL) Rows Removed by Filter: 257457 -> Seq Scan on workitems (cost=0.00..36655.53 rows=623353 width=43) (actual time=0.020..220.215 rows=623175 loops=1) -> Hash (cost=135.97..135.97 rows=1897 width=16) (actual time=2.177..2.177 rows=1897 loops=1) Buckets: 2048 Batches: 1 Memory Usage: 105kB -> Seq Scan on projects (cost=0.00..135.97 rows=1897 width=16) (actual time=0.013..1.451 rows=1897 loops=1) Planning time: 2.775 ms Execution time: 1873.308 ms Projects table has the index: Indexes: "projects_pkey" PRIMARY KEY, btree (id) "index_projects_on_company_id" btree (company_id) "index_projects_on_deleted_at" btree (deleted_at) "index_projects_on_inspector_id" btree (inspector_id) "index_projects_on_managed_offline_by_user_id" btree (managed_offline_by_user_id) "index_projects_on_project_status_id" btree (project_status_id) "index_projects_on_shipyard_id" btree (shipyard_id) "index_projects_on_vessel_id" btree (vessel_id) Workitems table has the index: Indexes: "workitems_pkey" PRIMARY KEY, btree (id) "index_workitems_on_company_id" btree (company_id) "index_workitems_on_deleted_at" btree (deleted_at) "index_workitems_on_parent_workitem_id" btree (parent_workitem_id) "index_workitems_on_project_id" btree (project_id) "index_workitems_on_standard_workitem_id" btree (standard_workitem_id) "index_workitems_on_workitem_category_id" btree (workitem_category_id) |
