如何将 3 个单独的 SQL 语句组合成一组结果

Question

我有一个 SQL 查询，我是运行 3 次（3 次仅更改日期范围）并且想将结果合并为一个 table，而不是运行 3 个不同的查询并试图在 SQL 之外加入。我试图找出每个 day/month/year 发生某事的次数。我在 SQL 服务器中运行这个。

我有 2 个 table；一个有交易日期，另一个有我需要的信息（InventoryNumber table 的前 3 个字符）所以我必须加入这些 table。然后我想按库存编号的前 3 个字符分组，并在列中添加计数。

最终目标是拥有如下所示的内容：

InvNum | DayCount | MonthCount | YearCount
abc    | 2        | 10         | 40
def    | 0        | 2          | 6
xyz    | 0        | 0          | 2

这是我对第一天的查询。这完全像我想要的那样工作。但是现在，我想在其中添加月份的计数，然后还有当年的计数。此查询与其他 2 个查询之间唯一会发生变化的是计数列名称，然后是日期。:

SELECT 
    LEFT(LINEITEM.InventoryNumber, 3) AS InvNum, 
    COUNT(*) AS DailyCount
FROM
    INVOICE
INNER JOIN  
    LINEITEM ON INVOICE.InvoiceID = LINEITEM.InvoiceID
WHERE
    InventoryNumber IS NOT Null
    AND InventoryNumber != 'Misc'
    AND DateCreated > '5-20-2022'
GROUP BY 
    LEFT(LINEITEM.InventoryNumber, 3)
ORDER BY 
    InvNum ASC;

我查看了其他一些与此类似的问题，但他们的查询要简单得多，我无法用我的查询复制相同的内容。

感谢任何帮助。

Answer 1

您需要根据 where 子句中的列和日期编写三个查询，每个查询结果在这些 table 中

只需更改每个 table

的 where 子句中的列和日期值

第一个查询结果

InvNum | DayCount 
abc    | 2        
def    | 0        
xyz    | 0

第二次查询结果：

InvNum  | MonthCount
abc     | 10        
def     | 2          
xyz     | 0

第三次查询结果：

InvNum | YearCount
abc    | 40
def    | 6
xyz    | 2

然后将这三个 table 加入 InvNum 列

Answer 2

这里还不够了解，你应该考虑条件聚合

Declare @D Date='2022-05-20';

SELECT InvNum     = LEFT(LINEITEM.InventoryNumber, 3)
      ,DayCount   = sum( case when DateCreated = @D then 1 else 0 end ) 
      ,MonthCount = sum( case when month(DateCreated) = month(@D) then 1 else 0 end ) 
      ,YearCount  = sum( case when year(DateCreated) = year(@D) then 1 else 0 end ) 
 FROM  INVOICE
INNER JOIN  LINEITEM ON INVOICE.InvoiceID = LINEITEM.InvoiceID
WHERE InventoryNumber IS NOT Null
  AND InventoryNumber <> 'Misc'
  AND DateCreated >= format(@D,'yyyy-01-01')
GROUP BY LEFT(LINEITEM.InventoryNumber, 3)
ORDER BY InvNum ASC;

Answer 3

这可能会为您完成工作：

SELECT ISNULL(DailyQuery.InvNum, ISNULL(MonthlyQuery.InvNum, YearlyQuery.InvNum)) as InvNum,
       ISNULL(DailyCount,0) as DailyCount,
       ISNULL(MonthlyCount,0) as MonthlyCount,
       ISNULL(YearlyCount,0) as YearlyCount
FROM
(SELECT 
    LEFT(LINEITEM.InventoryNumber, 3) AS InvNum, 
    COUNT(*) AS DailyCount
FROM
    INVOICE
INNER JOIN  
    LINEITEM ON INVOICE.InvoiceID = LINEITEM.InvoiceID
WHERE InventoryNumber != 'Misc'
    AND DateCreated > DATEADD(day, DATEDIFF(day, 0,  GETDATE()-1), 0) --first hour day before
GROUP BY 
    LEFT(LINEITEM.InventoryNumber, 3)
) DailyQuery
FULL JOIN 
(SELECT 
    LEFT(LINEITEM.InventoryNumber, 3) AS InvNum, 
    COUNT(*) AS MonthlyCount
FROM
    INVOICE
INNER JOIN  
    LINEITEM ON INVOICE.InvoiceID = LINEITEM.InvoiceID
WHERE InventoryNumber != 'Misc'
    AND DateCreated > DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0) --first day of current month
GROUP BY 
    LEFT(LINEITEM.InventoryNumber, 3) ) MonthlyQuery ON DailyQuery.InvNum = MonthlyQuery.InvNum
FULL JOIN 
(SELECT 
    LEFT(LINEITEM.InventoryNumber, 3) AS InvNum, 
    COUNT(*) AS YearlyCount 
FROM
    INVOICE
INNER JOIN  
    LINEITEM ON INVOICE.InvoiceID = LINEITEM.InvoiceID
WHERE InventoryNumber != 'Misc'
    AND DateCreated > DATEADD(year, DATEDIFF(year, 0, GETDATE()), 0) --first day of current month
GROUP BY 
    LEFT(LINEITEM.InventoryNumber, 3) ) YearlyQuery ON MonthlyQuery.InvNum = YearlyQuery.InvNum

Answer 4

看来您需要具有三个不同开始日期的条件聚合。

DECLARE @D date = '2022-05-20';
DECLARE @M date = '2022-04-21';
DECLARE @Y date = '2021-05-21';

SELECT InvNum     = LEFT(li.InventoryNumber, 3)
      ,DayCount   = COUNT(CASE WHEN i.DateCreated >= @D THEN 1 END)
      ,MonthCount = COUNT(CASE WHEN i.DateCreated >= @M THEN 1 END)
      ,YearCount  = COUNT(*)
 FROM INVOICE i
INNER JOIN LINEITEM li ON i.InvoiceID = li.InvoiceID
WHERE li.InventoryNumber <> 'Misc'
  AND i.DateCreated >= @Y
GROUP BY
  LEFT(li.InventoryNumber, 3)
ORDER BY
  InvNum;

Note that <> 'Misc' also excludes nulls, and that ASC is the default.

您还可以动态计算这些开始日期

DECLARE @D date = DATEADD(day, -1, CAST(GETDATE() AS date));
DECLARE @M date = DATEADD(month, -1, CAST(GETDATE() AS date));
DECLARE @Y date = DATEADD(year, -1, CAST(GETDATE() AS date));

如何将 3 个单独的 SQL 语句组合成一组结果

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