尝试在两个 with 语句之后使用选择查询

Posted 2023-03-23

【中文标题】尝试在两个 with 语句之后使用选择查询

【英文标题】：Trying to use a select query after two with statements

【发布时间】：2021-12-31 00:10:11

【问题描述】：

我计划用查询创建两个临时表，一个给出剩余贷款支付的总和，一个给出表中所有交易的总和。我已经用语句测试了这两个，它们可以自己工作，但是尝试使用它们执行选择查询似乎只会返回错误。

WITH RemainingLoans AS(SELECT SUM(TIMESTAMPDIFF(MONTH, l.NextPayment, l.FullPaymentConfirmed) * l.MonthlyPaymentRate) AS RemainingPayments FROM loans AS l);
WITH CurrentBalances AS(SELECT SUM(t.amount) AS allBalances FROM transactions AS t);
SELECT l.RemainingPayments - b.allBalances AS TotalOutstandings FROM RemainingLoans AS l, CurrentBalances AS b;

第一个称为 RemainingLoans，具有一个属性 RemainingPayments，第二个称为 CurrentBalances，具有一个属性 allBalances。据我所知，这些应该像表格一样工作，这就是为什么我在第三行尝试我的 select 子句，但是我目前遇到语法错误。有没有正确的方法来格式化我的 select 语句？

【问题讨论】：

您使用的是哪个版本的 mysql？ SELECT version(); 确切的错误是什么？将这两个细节都添加到问题中。

WITH 列表元素用逗号分隔。列表开头只有一个 WITH 关键字。分号位于整个语句的末尾，而不是 WITH 列表元素之后。

类似这样的东西：WITH RemainingLoans AS(SELECT SUM(TIMESTAMPDIFF(MONTH, l.NextPayment, l.FullPaymentConfirmed) * l.MonthlyPaymentRate) AS RemainingPayments FROM loans AS l) , CurrentBalances AS(SELECT SUM(t.amount) AS allBalances FROM transactions AS t) SELECT l.RemainingPayments - b.allBalances AS TotalOutstandings FROM RemainingLoans AS l, CurrentBalances AS b ;

谢谢您，这完全解决了问题。

@JonArmstrong 这应该是一个答案。

【参考方案1】：

这应该是一个语句，而不是多个语句。

The fiddle

WITH 列表元素用逗号分隔。列表开头只有一个 WITH 关键字。

分号位于整个语句的末尾，而不是WITH 列表元素之后。

这是调整后的声明：

WITH RemainingLoans AS (
       SELECT SUM(TIMESTAMPDIFF(MONTH, l.NextPayment, l.FullPaymentConfirmed) * l.MonthlyPaymentRate) AS RemainingPayments
         FROM loans AS l
     )
   , CurrentBalances AS (
       SELECT SUM(t.amount) AS allBalances
         FROM transactions AS t
     )
SELECT l.RemainingPayments - b.allBalances AS TotalOutstandings
  FROM RemainingLoans  AS l
     , CurrentBalances AS b
;