尽管行数为0，但sql查询中需要单行

下面是我的查询，它不返回任何行，根据数据库记录，这是正确的

SELECT  CustomerID ,
        'Forwarder' AS CustType ,
        RForLocation ,
        YEAR(ReceivedDate) AS CurrentYear ,
        CONVERT(VARCHAR, COUNT(CASE WHEN MONTH(ReceivedDate) = 1 THEN 1
                                    ELSE 0
                               END)) AS Jan
FROM    RootTable
WHERE   Customerid = 12742
        AND YEAR(ReceivedDate) = 2014
GROUP BY CustomerID ,
        RForLocation ,
        YEAR(ReceivedDate)

但我的要求是，我应该得到一个空行，customerId、custype、CurrentYear和Jan Count为零（0）

以下是我的要求

CustomerId  CustType   CurrentYear   Jan
12742       Forwarder   2014          0

谢谢

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请帮助

更改您的

案例

声明

SELECT    CustomerID 
        ,'Forwarder' AS CustType
        ,RForLocation 
        ,YEAR(ReceivedDate) AS CurrentYear
        ,ISNULL(
          NULLIF(
              COUNT(CASE WHEN MONTH(ReceivedDate) = 1 THEN 1 ELSE 0 END)
                 , 0)
              , '')
                                     AS Jan
FROM    RootTable
WHERE   Customerid = 12742
        AND YEAR(ReceivedDate) = 2014
GROUP BY CustomerID ,
        RForLocation ,
        YEAR(ReceivedDate)

CONVERT(VARCHAR, CASE WHEN count(MONTH(ReceivedDate) = 1) 
                           THEN count(MONTH(ReceivedDate) = 1) 

               ELSE 0
end

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无论我能理解什么，请找到脚本和更新的查询，我用它尝试了

创建表：

Create table RootTable
(CustomerID int, 
    RForLocation varchar(20), 
    ReceivedDate datetime)

插入数据：

insert into RootTable
Values(1, 'A', '1-Jan-2013'),
    (2, 'A', '1-Feb-2013'),
    (3, 'B', '1-Jan-2013'),
    (4, 'B', '1-Mar-2013')

查询以获取记录：

SELECT  CustomerID ,
        'Forwarder' AS CustType ,
        RForLocation ,
        '2014' AS CurrentYear ,
        CONVERT(VARCHAR, COUNT(CASE WHEN MONTH(ReceivedDate) = 1 AND YEAR(ReceivedDate) = 2014 THEN 1
                                    ELSE null
                               END)) AS Jan
FROM    RootTable
WHERE   Customerid = 1
GROUP BY CustomerID ,
        RForLocation;

因为我想要客户的记录，即使他没有特定年份的任何记录，我不需要在where子句中给出日期条件，相反，我可以根据年份进行计数，这将提供我所需的输出

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希望有帮助。

不清楚。如果表中没有数据，您希望获得哪个客户id、客户类型、当前年份和一月？表中有该客户的数据，但它们不属于2014年，它们都属于2013年。但我需要的是它应该返回一月份的零计数行，这可能会有帮助…不，这不会工作相同的结果没有行，我需要ReceivedDate=1，因为稍后我将包括2月、3月…一年中的所有月份。不确定你说的空行是什么意思。显示一些示例数据和所需的输出，也许我可以提供帮助。仅列标题。。CustomerId CustType CurrentYear Jan请再次阅读我的帖子…我需要一个值为零的行，而不是现在的行或任何月份..如果数据库中没有记录，是否有任何方法可以获得一个带有这些值的空行..CustomerId CustType CurrentYear Jan 12742 Forwarder 2014 0我已经编辑了我的答案。你能再试一次代码吗。很遗憾，我没有访问MySQL实例进行测试的权限。SQL Server中需要此查询。当sub1.CNT为空时，您的查询在此行中显示错误，然后将0 ELSE sub.CNT作为月份名称，

SELECT  CustomerID ,
        'Forwarder' AS CustType ,
        RForLocation ,
        '2014' AS CurrentYear ,
        CONVERT(VARCHAR, COUNT(CASE WHEN MONTH(ReceivedDate) = 1 AND YEAR(ReceivedDate) = 2014 THEN 1
                                    ELSE null
                               END)) AS Jan
FROM    RootTable
WHERE   Customerid = 1
GROUP BY CustomerID ,
        RForLocation;