跨数据库查询未返回所需结果

编程问答 2022-06-11

问题描述

我正在尝试从另一个数据库“ Finantial”中获取数据，但返回的结果与我在另一个数据库中使用相同代码减去dblinks得到的结果不同

这是我遇到问题的代码：

select trans.accountid,sum(trans.amount)as montantpaye,loan.amount-sum(trans.amount) as montantrestant,loan.duration-count(trans.transid) as moisrestant
from (SELECT * FROM dblink('user=postgres password=password dbname=finantial','select amount,accountid,duration from loan')
    AS loan(amount int,accountid int,duration int)) as loan,(SELECT * FROM dblink('user=postgres password=password dbname=finantial','select accountid from account')
    AS account(accountid int)) as account,ksymbol,transid from trans')
    AS trans(accountid int,amount int,ksymbol varchar,transid int)) as trans
 where trans.ksymbol='UVER' and
        account.accountid=loan.accountid and
        trans.accountid=account.accountid
group by (trans.accountid,loan.amount,loan.duration)

这就是我得到的

enter image description here

而当我使用以下代码在“ finantial”数据库中查询此数据时：

select trans.accountid,sum(trans.amount)as montant_paye,loan.amount-sum(trans.amount) as montant_restant,loan.duration-count(trans.transid) as moisrestant
from loan,account,trans
 where account.accountid=loan.accountid and ksymbol='UVER' and trans.accountid=account.accountid
group by (trans.accountid,loan.duration)

我得到这个结果：

enter image description here

如果您能告诉我我需要在代码中修复的内容，我将不胜感激。

解决方法

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