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CREATE TABLE expenditures (id int, category text, parent_id int, note text); INSERT INTO expenditures VALUES (1, 'order', null, 'order with no invoices'), (2, 'order', null, 'order with invoices'), (3, 'invoice', 2, 'invoice for order 2'), (4, 'invoice', 2, 'invoice for order 2'); CREATE TABLE expenditure_items (id int, expenditure_id int, cbs_item_id int, total int, note text); INSERT INTO expenditure_items VALUES (1, 1, 1, 5, 'Fuit'), (2, 1, 2, 15, 'Veggies'), (3, 2, 1, 123, 'Fuit'), (4, 2, 2, 456, 'Veggies'), (5, 3, 1, 34, 'Fuit'), (6, 3, 2, 76, 'Veggies'), (7, 4, 1, 26, 'Fuit'), (8, 4, 2, 98, 'Veggies');
4 rows affected
8 rows affected
SELECT cbs_item_id, sum(order_total - invoice_total) AS remaining FROM ( SELECT cbs_item_id , COALESCE(e.parent_id, e.id) AS expenditure_id , COALESCE(sum(total) FILTER (WHERE e.category = 'order' ), 0) AS order_total , COALESCE(sum(total) FILTER (WHERE e.category = 'invoice'), 0) AS invoice_total FROM expenditures e JOIN expenditure_items i ON i.expenditure_id = e.id GROUP BY 1, 2 ) sub GROUP BY 1 ORDER BY 1;
cbs_item_id
remaining
1
68
2
297