顯示器1如果所有分組的行是1，否則顯示0

Question

我有這樣的查詢：

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invoices我有一個柱paid其是tinyint即1或0。

添加到查詢我有，我怎樣才能使返回paid列顯示1如果所有的分組paid列行等於1否則顯示0爲paid列？

Answer 1

我想你可以使用SQL中的分鐘關鍵字。例如：

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

選擇min（paid）也許？如果有0和1，則應該爲0。