Question

我想要执行一个Threshold查询，其中一个人将从Today获取一个字段的值，并将其与昨天的值进行比较，这个查询看起来像这样，但很明显，这是错误的，我找不到怎么做：

select 
   TableB.Name, 
   TableA.Charge, 
   ( 
     select Charge 
     from TableA 
     where (DateAdded >= '13/10/2009' and DateAdded < '14/10/2009')
   ) 
     from TableA

inner join 
   TableB on TableB.ID = TableA.ID

where 
   TableA.DateAdded >= '10/14/2009'

order by 
   Name asc

请注意，我正在寻找两个CHARGE字段，而不是日期。日期操作仅适用于今天和昨天，仅此而已。

最后，我想对两个返回的电荷字段进行计算，因此如果更容易显示，那也很棒。

提前致谢

凯尔

EDIT1：

我正在寻找的数据是这样的：

昨天，我们向MachineA收取500的费用今天我们向MachineA

输入300的费用

我们运行查询，我需要的结果如下：

Name = MachineA
Charge = 300
YesterdayCharge = 500

Answer 1

这样的事情？

SELECT 
   B.Name, 
   A.Charge,
   DATEPART(day, A.DateAdded) as day
FROM
   TableA A, Table B
WHERE
   B.ID = A.ID AND
   A.DateAdded BETWEEN DATEADD(day, -1, GETDATE()) AND GETDATE()
GROUP BY
   B.Name, 
   A.Charge,
   A.DateAdded

Answer 2

试试这个：

DECLARE @ValuesTable TABLE(Name VARCHAR(20), Charge INT, DateAdded DATETIME)

INSERT INTO @ValuesTable
SELECT 'Name1', 10, DATEADD(dd, 2, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name2', 20, DATEADD(dd, 2, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name1', 30, DATEADD(dd, 1, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name2', 40, DATEADD(dd, 1, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name1', 50, DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name2', 60, DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name1', 70, DATEADD(dd, -1, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name3', 80, DATEADD(dd, -1, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name1', 90, DATEADD(dd, -2, DATEDIFF(dd, 0, GETDATE())) UNION
SELECT 'Name2', 100, DATEADD(dd, -2, DATEDIFF(dd, 0, GETDATE()))


SELECT 
ISNULL(T.Name,Y.Name) AS Name, 
SUM(ISNULL(Y.Charge,0)) AS Yesterday, SUM(ISNULL(T.Charge,0)) AS Today,
SUM(ISNULL(T.Charge,0)) - SUM(ISNULL(Y.Charge,0)) AS Diff
FROM(
    SELECT Name, Charge 
    FROM @ValuesTable 
    WHERE DateAdded BETWEEN DATEADD(day, -2, GETDATE()) 
        AND DATEADD(day, -1, GETDATE())
) AS Y
FULL JOIN(
    SELECT Name, Charge 
    FROM @ValuesTable 
    WHERE DateAdded BETWEEN DATEADD(day, -1, GETDATE()) AND GETDATE()
) AS T ON ISNULL(T.Name,Y.Name) = ISNULL(Y.Name,T.Name)
GROUP BY ISNULL(T.Name,Y.Name) , ISNULL(Y.Name,T.Name)

Answer 3

如果您确实需要上一个日期（包括周末等），那么以下查询应该完成这项工作。否则，请发布数据样本和预期结果：

SELECT      TableB.Name,
            TableA.Charge,
            prev.Charge AS PrevCharge
FROM        TableA
INNER JOIN  TableB 
        ON  TableA.ID = TableB.ID
LEFT JOIN   TableA prev
        ON  TableA.ID = prev.ID
        --// use this if DateAdded contains only date
        --AND TableA.DateAdded = DATEADD(day, +1, prev.dateAdded)
        --// use this if DateAdded contains also time component
        AND CONVERT(DATETIME, CONVERT(CHAR(8), TableA.DateAdded, 112), 112) = DATEADD(day, +1, CONVERT(DATETIME, CONVERT(CHAR(8), prev.dateAdded, 112), 112))

对于DateAdded包含时间的情况，

edit-1：在JOIN中添加了选项

Answer 4

在SO中可能只是一个拼写错误，但如果您在同一查询中使用日期字符串'14 / 10/2009'和'10 / 14/2009'，它将无法正常工作。无论您使用哪种日期格式，其中一种格式都有太长的月份。

帮助SQL查询

4 个答案: