По какой-то неизвестной причине, запрос перемножить два поля SUM друг на друга:Почему Access умножает два SUM на eachother?
таблицы
products table
+----+--------+
| id | p_name |
+----+--------+
| 1 | name1 |
| 2 | name2 |
+----+--------+
warehouses table:
+----+------------+
| id | w_name |
+----+------------+
| 1 | warehouse1 |
| 2 | warehouse2 |
+----+------------+
intake table:
+--------------+------------+--------+
| warehouse_id | product_id | amount |
+--------------+------------+--------+
| 1 | 1 | 10 |
| 1 | 1 | 10 |
+--------------+------------+--------+
outtake table
+--------------+------------+--------+
| warehouse_id | product_id | amount |
+--------------+------------+--------+
| 1 | 1 | 5 |
| 1 | 1 | 5 |
+--------------+------------+--------+
запрос
SELECT warehouses.w_name,
products.p_name,
Sum(intake.units_amout) AS intakeSum,
Sum(outtake.amount) AS outtakeSum
FROM (warehouses
INNER JOIN (products
INNER JOIN intake ON products.id = intake.product_id) ON warehouses.id = intake.warehouse_id)
INNER JOIN outtake ON (warehouses.id = outtake.warehouse_id)
AND (products.id = outtake.product_id)
GROUP BY warehouses.w_name,
products.p_name;
результат
+--------------+------------+-----------+------------+
| warehouse_id | product_id | intakeSum | outtakeSum |
+--------------+------------+-----------+------------+
| 1 | 1 | 40 | 20 |
+--------------+------------+-----------+------------+
ожидаемый результат
+--------------+------------+-----------+------------+
| warehouse_id | product_id | intakeSum | outtakeSum |
+--------------+------------+-----------+------------+
| 1 | 1 | 20 | 10 |
+--------------+------------+-----------+------------+
если я добавить третью запись на прием (с тем же продуктом и складских идентификаторами), то «outtakeSum» будет Multipy быть 3! и т. д.