php，postgresql，mysql

Question

我困在一個query.i不知道wats的問題確切..可以任何1幫助我？

下面是代碼：

而我運行的查詢，它拋出的錯誤：錯誤：關係「承包人」不存在 5號線：從「承包人」

select cont.name, cont.total,cp.contractor_id,cp.amount_paid,wt.id 
       FROM 
       (
        select name,sum(amount_to_be_paid) as total 
        from "CONTRACTORS" 
        group by name 
       ) cont 
       left join 
       (
        select contractor_id,sum(amount_paid) as amount_paid 
        from "CONTRACTOR_PAYMENTS" 
        group by contractor_id 
       ) cp 

        on cont.id= cp.contractor_id 
           left join worktypeids as wt on cont.worktypeid_id = wt.id AND wt.project_id=2 

Answer 1

試試這個

select cont.name, cont.total,cp.contractor_id,cp.amount_paid,wt.id 
       FROM 
       (
        select name,id, sum(amount_to_be_paid) as total 
        from contractors group by name,id 
       ) cont 
       left join 
       (
        select contractor_id,sum(amount_paid) as amount_paid 
        from contractor_payments 
        group by contractor_id 
       ) cp 

        on cont.id = cp.contractor_id 
           left join worktypeids as wt on cont.worktypeid_id = wt.id AND wt.project_id=2 

Answer 2

你可以添加表結構也？

在命名爲cont第一別名，這與cp加盟，所以續，你需要選擇id列好。

更好的發佈表結構和你想要的輸出？