vb.net 和访问数据库问题

Question

我收到了这个错误：

您的查询不包含指定的表达式作为 聚合函数

当我尝试执行此操作时：

SELECT DISTINCT invoice_details.item,
SUM((invoice_details.cartoons * products.punits) + invoice_details.units) as units,
SUM(invoice_details.total) as total
FROM invoice_details, products, invoices
WHERE invoices.invoice_id = invoice_details.invoice_id
and products.pname = invoice_details.item
and format(invoices.create_date, "d/mm/yyyy") = DATE()

Answer 1

Sum 是一个聚合函数，因此在查询中调用的所有其他字段都必须在 Group by 子句中使用。这可能会解决问题。