从多访问表中选择答案

【问题标题】：Select from multi access tables从多访问表中选择
【发布时间】：2017-11-14 10:37:51
【问题描述】：

尝试获取此查询的结果：

SELECT DISTINCT
       invoices.invoice_id,
       invoices.customer,
       invoices.total,
       SUM(pay_amount) AS paid
FROM invoices,
     invoice_payment
WHERE invoices.invoice_id = invoice_payment.invoice_id
      AND invoices.type = 'client'
      AND invoice_payment.pay_type <> 'postpaid'
      AND format(invoices.create_date, "dd/mm/yyyy") BETWEEN '01/11/2017' AND '14/11/2017';

我明白了

"您的查询不包含特定表达式 'invoice_id' 作为聚合函数的一部分”

【问题讨论】：

标签： sql vb.net ms-access

【解决方案1】：

在聚合数据时添加GROUP BY，例如计数，总和等

像这样：

SELECT DISTINCT
       invoices.invoice_id,
       invoices.customer,
       invoices.total,
       SUM(pay_amount) AS paid
FROM invoices,
     invoice_payment
WHERE invoices.invoice_id = invoice_payment.invoice_id
      AND invoices.type = 'client'
      AND invoice_payment.pay_type <> 'postpaid'
      AND format(invoices.create_date, "dd/mm/yyyy") BETWEEN '01/11/2017' AND '14/11/2017'
GROUP BY invoices.invoice_id,
         invoices.customer,
         invoices.total;

GROUP BY 的 Access 文档是 here

还要尽量避免使用旧式连接，它们既讨厌又过时。这样会好很多：

FROM invoices
INNER JOIN invoice_payment ON invoices.invoice_id = invoice_payment.invoice_id

【讨论】：

我真的不知道这意味着什么......如果您添加一些示例数据，那么它会更有意义。您希望它显示什么？