如何组合这些查询？答案

【问题标题】：How can I combine these queries?如何组合这些查询？
【发布时间】：2009-06-01 14:44:44
【问题描述】：

我有 5 个查询要一起加入。基本上，他们所做的就是浏览数据库，然后根据租客多久之前的收费来选择租户支付了多少，以及租户欠了多少。

我有四个类别
充电充电 = 30 天
充电 = 60 天
充电 > 90 天

我知道如何分别获取所有这些值，但是如何将它们汇总在一起，加上租户支付的金额？

以下是我的疑问：
租户已支付的金额

SELECT TransactionCode, TenantID, SUM(Amount) AS Paid FROM tblTransaction
WHERE Amount > 0
GROUP BY TransactionCode, TenantID

收费不到 30 天

SELECT TransactionCode, TenantID, SUM(Amount) AS ChargedCurrent FROM tblTransaction
WHERE Amount < 0 AND TransactionDate > DATEADD("dd", -30, GETDATE())
GROUP BY TransactionCode, TenantID

收费不到 60 天，但超过 29 天

SELECT TransactionCode, TenantID, SUM(Amount) AS ChargedOver30 FROM tblTransaction
WHERE Amount < 0 AND TransactionDate > DATEADD("dd", -60, GETDATE()) AND TransactionDate <= DATEADD("dd", -30, GETDATE())
GROUP BY TransactionCode, TenantID

收费不到 90 天，但超过 59 天

SELECT TransactionCode, TenantID, SUM(Amount) AS ChargedOver60 FROM tblTransaction
WHERE Amount < 0 AND TransactionDate > DATEADD("dd", -90, GETDATE()) AND TransactionDate <= DATEADD("dd", -60, GETDATE())
GROUP BY TransactionCode, TenantID

费用超过 89 天

SELECT TransactionCode, TenantID, SUM(Amount) AS ChargedOver90 FROM tblTransaction
WHERE Amount < 0 AND TransactionDate <= DATEADD("dd", -90, GETDATE())
GROUP BY TransactionCode, TenantID

如何通过一次查询获得所有这些信息？

【问题讨论】：

标签： sql sql-server-2005-express

【解决方案1】：

可以这样做：

SELECT TransactionCode, TenantID, 
SUM(CASE WHEN Amount > 0 then Amount ELSE 0 END) AS Paid,
SUM(CASE WHEN Amount < 0 AND TransactionDate > DATEADD("dd", -30, GETDATE()) THEN Amount ELSE 0 END) AS ChargedCurrent,  
SUM(CASE WHEN Amount < 0 AND TransactionDate > DATEADD("dd", -60, GETDATE()) AND TransactionDate <= DATEADD("dd", -30, GETDATE()) THEN Amount ELSE 0 END) AS ChargedOver30
SUM(CASE WHEN Amount < 0 AND TransactionDate > DATEADD("dd", -90, GETDATE()) AND TransactionDate <= DATEADD("dd", -60, GETDATE()) then Amount Else 0 END) AS ChargedOver60,
SUM(CASE WHEN Amount < 0 AND TransactionDate <= DATEADD("dd", -90, GETDATE()) THEN Amount ELSE 0 END) AS ChargedOver90 
FROM tblTransaction
GROUP BY TransactionCode, TenantID

【讨论】：

Msg 102, Level 15, State 1, Line 2 ')' 附近的语法不正确。
你需要在 CASE 语句的末尾加上 'END'，这是 T-SQL
“GROUP BY TransactionCode, TenantID”将为每个 TransactionCode, TenantID 提供一行；我不确定你的意思？

【解决方案2】：

使用 UNION 将结果集拼接在一起会起作用。您可能希望使用 PIVOT 功能将其转换为单独的列。抱歉，我不能说得更具体，我没有笔记，而且我不知道这些东西的确切语法。

【讨论】：

【解决方案3】：

这个交叉表查询应该可以工作：

SELECT 
Case WHEN Amount > 0 Then Amount Else 0 End as [Total],
Case WHEN Amount < 0 AND TransactionDate > DATEADD("dd", -30, GETDATE())
    Then Amount Else 0 End as [Charge 0-29 Days],
Case WHEN Amount < 0 AND TransactionDate > DATEADD("dd", -60, GETDATE()) AND TransactionDate <= DATEADD("dd", -30, GETDATE()) 
    Then Amount Else 0 End as [Charge 30-59 Days],
Case WHEN Amount < 0 AND TransactionDate > DATEADD("dd", -90, GETDATE()) AND TransactionDate <= DATEADD("dd", -60, GETDATE()) 
    Then Amount Else 0 End as [Charge 60-89 Days],
Case WHEN Amount < 0 AND TransactionDate <= DATEADD("dd", -90, GETDATE())
     Then Amount Else 0 End as [Charge 90+ Days],

来自 tblTransaction 按事务代码、租户 ID 分组

【讨论】：

好吧，老鼠，米特打败了我。为什么我没有收到任何更新通知？

【解决方案4】：

如果您可以在所有 5 个单独的查询中使查询的投影或形状相同，则可以使用联合不仅将查询组合成一个结果，还可以对结果进行排序。我已经修改了最后一列以保持一致并代表收费的状态，以便您从结果中过滤：

SELECT TransactionCode, TenantID, SUM(Amount) [Amount], 'Paid' [Status]
FROM tblTransactionWHERE Amount > 0
GROUP BY TransactionCode, TenantID

union

SELECT TransactionCode, TenantID, SUM(Amount) [Amount], 'Charged Current' [Status]
FROM tblTransactionWHERE Amount < 0 AND TransactionDate > DATEADD("dd", -30, GETDATE())
GROUP BY TransactionCode, TenantID

union

SELECT TransactionCode, TenantID, SUM(Amount) [Amount], 'ChargedOver30' [Status]
FROM tblTransactionWHERE Amount < 0 AND TransactionDate > DATEADD("dd", -60, GETDATE()) AND TransactionDate <= DATEADD("dd", -30, GETDATE())
GROUP BY TransactionCode, TenantID

union

SELECT TransactionCode, TenantID, SUM(Amount) [Amount], 'ChargedOver60' [Status]
FROM tblTransactionWHERE Amount < 0 AND TransactionDate > DATEADD("dd", -90, GETDATE()) AND TransactionDate <= DATEADD("dd", -60, GETDATE())
GROUP BY TransactionCode, TenantID

union

SELECT TransactionCode, TenantID, SUM(Amount) [Amount], 'ChargedOver90' [Status]
FROM tblTransactionWHERE Amount < 0 AND TransactionDate <= DATEADD("dd", -90, GETDATE())
GROUP BY TransactionCode, TenantID

order by 4 --Status

【讨论】：

有没有办法将它们全部放在一行中，而不是分散在 5 行中？

【解决方案5】：

为每个查询添加一个额外的列

SELECT TransactionCode, TenantID, SUM(Amount) AS ChargedCurrent, 30 as [DaysLate] FROM tblTransaction...

然后将所有查询联合起来

【讨论】：