Sql server 如何使用datediff函数在sql的不同列中显示月份名称

我有一个疑问：

DECLARE @month INT
SET @month=1

SELECT 

    CLOI_ClientOrderItems.cl_Id,

    NoOfInv = SUM(CASE WHEN DATEPART(mm, in_date_issued) <= @month
                        AND DATEPART(yyyy, in_date_issued) = 2014
                       THEN 1 ELSE 0 END),

    MonthTotal = SUM(CASE WHEN DATEPART(mm, in_date_issued) <= @month 
                           AND DATEPART(yyyy, in_date_issued) = 2014
                          THEN in_total ELSE 0 END),

    Grandtotal = SUM(in_total),

    RemainingAmount = SUM(in_total) - SUM(CASE 
                          WHEN DATEPART(mm, in_date_issued) <= @month 
                          THEN in_total ELSE 0 END)


FROM (SELECT 
          DISTINCT MasterOrderId, cl_Id 
      FROM 
          CLOI_ClientOrderItems) as CLOI_ClientOrderItems 

INNER JOIN 
      IN_Invoices 
ON
      IN_Invoices.MasterOrderId = CLOI_ClientOrderItems.MasterOrderId
GROUP BY 
      CLOI_ClientOrderItems.cl_id

DECLARE@month INT
设置@month=1
挑选
CLOI_ClientOrderItems.cl_Id，
NoOfInv=SUM（DATEPART（mm，in_date_issued）时的情况）在条件对您有用的情况下尝试此方法

 select Datename(mm,in_date_issued) from IN_Invoices Where Datediff(yyyy,in_date_issued,3) = 2014 and Datediff(mm,in_date_issued,@monthParameter) <= 3

从日期差异（yyyy，日期差异，3）=2014和日期差异（mm，日期差异，@monthParameter）的发票中选择日期名称（mm，日期差异），您可以这样尝试

 declare @MonthCount int=1
 SELECT DATENAME(month, DATEADD(month, @MonthCount-1 , 
CAST('2014-01-01' AS datetime))) as Month_Name

作品:

Datename（mm，@paramMonth）选择Datediff（yyyy，in-date，3）=2014和Datename（mm，in-date），任何人都可以帮助我修改该问题，现在尝试输入错误“Datediff函数需要3个参数。”我想在diff列中显示月份名称…列名称如jan、feb、march，如tatreplygor查询pls
 declare @MonthCount int=1
 SELECT DATENAME(month, DATEADD(month, @MonthCount-1 , 
CAST('2014-01-01' AS datetime))) as Month_Name

Month_Name
January