Question

我在查询一个列上有问题，差异值显示在PosgrestSql的2列结果中。显示值意味着突出，显示已经支付的0均值。并且需要显示所有待处理的列并计算已经支付的新列。我尝试了很多查询，但无法找到。

我的第一个查询如下： first query

然后我需要如下结果： I need the result

对于我的新查询，我尝试如下：

SELECT
  m.customercd,
  ta.agreementcd,
  (SELECT
    (tcd.balanceprincipal + tcd.balanceinterest + tcd.balanceapprovalfeeprincipal)
  FROM t_agreement ta
  INNER JOIN t_creditdetail tcd
    ON ta.agreementcd = tcd.agreementcd
  WHERE (tcd.balanceprincipal + tcd.balanceinterest + tcd.balanceapprovalfeeprincipal) != 0)
  AS Installment,
  (SELECT
    (tcd.balanceprincipal + tcd.balanceinterest + tcd.balanceapprovalfeeprincipal)
  FROM t_agreement ta
  INNER JOIN t_creditdetail tcd
    ON ta.agreementcd = tcd.agreementcd
  WHERE (tcd.balanceprincipal + tcd.balanceinterest + tcd.balanceapprovalfeeprincipal) = 0)
  AS Installment_PAID,
  m.corpname,
  m.employeenum
FROM t_agreement ta
INNER JOIN t_creditdetail tcd
  ON ta.agreementcd = tcd.agreementcd
INNER JOIN m_customer m
  ON ta.customercd = m.customercd
WHERE ta.agreementcd IN ('1502-0004759-9', '1506-0006177-9', '1506-0006327-8')
ORDER BY agreementcd

但仍然有错误：

错误：用作表达式
的子查询返回的多行

有没有专家帮我解决这个问题？非常感谢你的帮助。

非常感谢， SmallCorner

Answer 1

好吧，我不得不打破每个查询以了解发生了什么，所以这里实际上是你的主查询删除子查询并替换w / comments

主要查询

select
  m.customercd,
  ta.agreementcd,
  # installment sub query
  # installment paid sub-query
  m.corpname,
  m.employeenum
from t_agreement ta
  JOIN t_creditdetail tcd ON ta.agreementcd = tcd.agreementcd
  JOIN m_customer m ON ta.customercd = m.customercd
where  ta.agreementcd in ('1502-0004759-9','1506-0006177-9','1506-0006327-8')
order by agreementcd;

未付款的分期付款

select
  tcd.balanceprincipal + tcd.balanceinterest  + tcd.balanceapprovalfeeprincipal AS installment
from t_agreement ta
  JOIN t_creditdetail tcd ON ta.agreementcd = tcd.agreementcd
where
  (tcd.balanceprincipal + tcd.balanceinterest  + tcd.balanceapprovalfeeprincipal) != 0;

付费分期付款

select
  tcd.balanceprincipal + tcd.balanceinterest  + tcd.balanceapprovalfeeprincipal as installment_paid
from t_agreement ta
JOIN t_creditdetail tcd ON ta.agreementcd = tcd.agreementcd
where
  (tcd.balanceprincipal + tcd.balanceinterest  + tcd.balanceapprovalfeeprincipal) = 0;

我删除了INNER JOIN，因为它与JOIN相同。你应该尽力避免使用子查询（增加了复杂性，性能问题），但是如果你必须使用它们（我必须在工作中无数次）你应该自己运行它们以查看它们返回的结果。在你的情况下，我认为你甚至不能在select语句中使用子查询，因为它们需要绑定到你的同意。您必须将它们用作连接。无论哪种方式，这个答案都应该有效。

<强>答案

select
  m.customercd,
  ta.agreementcd,
  tcd.balanceprincipal + tcd.balanceinterest + tcd.balanceapprovalfeeprincipal AS balance,
  m.corpname,
  m.employeenum
from t_agreement ta
  JOIN t_creditdetail tcd ON ta.agreementcd = tcd.agreementcd
  JOIN m_customer m ON ta.customercd = m.customercd
where
  ta.agreementcd in ('1502-0004759-9','1506-0006177-9','1506-0006327-8')
  and (tcd.balanceprincipal + tcd.balanceinterest  + tcd.balanceapprovalfeeprincipal) != 0  # unpaid balances
order by agreementcd;

如何选择一列显示为2列结果与Postgresql中的差异值

1 个答案: