[英]SQL Sum() - 0 in field excluding row from aggregation?
考慮以下查詢:
$query = "
SELECT a_orders.id, a_orders.billing,
SUM(a_order_rows.quant_refunded*a_order_rows.price*((100-a_orders.discount)*.01)) as refund_total,
SUM(a_order_rows.quant*a_order_rows.price*((100-a_orders.discount)*.01)) as order_total
FROM a_order_rows JOIN a_orders
ON a_order_rows.order_id = a_orders.id
WHERE a_order_rows.quant_refunded > 0
GROUP BY a_orders.id, a_orders.billing
ORDER BY a_orders.id DESC
LIMIT 50";
SUM()的兩種用法試圖匯總訂單總額和已退款的總額。 當quant_refunded字段不為0時,它們可以正確顯示出來...例如,以該數據(為簡單起見,假設主行,唯一行除外,假設每一行都是唯一的項,則不包括主鍵,item_id):
Table: a_order_rows
Fields: order_id, quant, quant_refunded
1, 1, 1
1, 2, 1
2, 1, 1
2, 1, 0
在“順序1”的情況下,這兩個聚合是不同的,並且行為符合預期。 但是對於“第2階”來說,這兩個數字是相同的-這兩個數字都是我期望的return_total。 看來quantum_refunded中具有“ 0”的行已從order_total聚合中排除。
希望對此有足夠的解釋。 如果您需要更多信息,請告訴我,我會進行修改。 謝謝!
$query = "
SELECT a_orders.id, a_orders.billing,
SUM(a_order_rows.quant_refunded*a_order_rows.price*((100-a_orders.discount)*.01)) as refund_total,
SUM(a_order_rows.quant*a_order_rows.price*((100-a_orders.discount)*.01)) as order_total
FROM a_order_rows JOIN a_orders
ON a_order_rows.order_id = a_orders.id
GROUP BY a_orders.id, a_orders.billing
HAVING MAX(a_order_rows.quant_refunded) > 0
ORDER BY a_orders.id DESC
LIMIT 50";
將其更改為HAVING子句。 如果任何quant_refunded行> 0,則HAVING MAX
將保留它。
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