如果所有分组行都为1则显示1，否则显示0

Question

我有这个问题：

select *, sum(services.amount) as service_amount from invoices
left join projects using(project_id)
left join services using(invoice_id)
where client_id = ?
group by project_id
order by issue_date desc

在表格invoices中，我有一个paid列，tinyint或1。

如果所有分组的0列行等于paid，则如果添加到查询，我将如何显示返回的1列paid 1 0 1}} paid列？

Answer 1

我认为您可以在sql中使用 min 关键字。类似的东西：

select MIN(paid), sum(services.amount) as service_amount from invoices
left join projects using(project_id)
left join services using(invoice_id)
where client_id = ?
group by project_id
order by issue_date desc

Answer 2

选择分钟（付费）可能吗？如果有0则为0，否则为1。