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我有一个 mysql 查询来获取要接收的发票付款总额：

SELECT
SUM(amount * ((vat / 100) + 1)) AS total
FROM invoices
WHERE status = 'send' AND date_paid = 0

我还有一张存储收到的金额的表格。如何处理部分支付的发票，以便我可以看到收到的真实金额？我正在使用一个表来存储名为 payment_rev 的付款以及列 invoice_id 和金额。

我努力了：

SELECT
SUM(amount * ((vat / 100) + 1)) AS total,
SUM(pd.amount) AS total_paid
FROM invoices AS inv
LEFT JOIN 11_invoices_paid AS pd
ON pd.inv_id = inv.id
WHERE inv.status = 'send' AND inv.date_paid = 0
GROUP BY inv.id

结果它给出了 total_paid = 0 ??

CREATE TABLE IF NOT EXISTS `invoices` (
  `id` int(6) NOT NULL AUTO_INCREMENT,
  `dossier_id` int(6) NOT NULL,
  `invoice_no` int(5) NOT NULL,
  `amount_excl` decimal(8,2) NOT NULL,
  `vat` int(2) NOT NULL,
  `date_send` date NOT NULL,
  `date_pay` date NOT NULL,
  `date_paid` date NOT NULL,
  `status` varchar(10) NOT NULL
  PRIMARY KEY (`id`)

)

CREATE TABLE IF NOT EXISTS `invoices_paid` (
  `id` int(6) NOT NULL AUTO_INCREMENT,
  `invoice_id` int(6) NOT NULL,
  `amount` decimal(8,2) NOT NULL,
  `date` date NOT NULL
  PRIMARY KEY (`id`)

)

4

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