将json分配给变量时，SQL Server中的数据被截断

我想使用T-SQL生成JSON并将其存储在变量中。当我将JSON分配给NVARCHARMAX时，数据会被截断，但如果我直接使用select语句，数据不会被截断

DECLARE @DateOne DATETIME, @DateTwo DATETIME,@DrillThroughData NVARCHAR(MAX)
SELECT @DateOne = '2016-01-01',@DateTwo = '2017-07-31'

 CREATE TABLE #DrillThroughData
 (
[Date] DATE
,TotalAmountIncome DECIMAL(18,4)
,TotalAmountRefunded DECIMAL(18,4)
,ProductCostIncome DECIMAL(18,4)
,ProductCostRefunded DECIMAL(18,4)
)

INSERT INTO #DrillThroughData
VALUES('2017-07-13',839.2000,-241.4000,0.0000,0.0000)

;WITH CTE AS
     (
    SELECT 1 SNo,CAST(CONVERT(NVARCHAR(6),@DateOne,112)+'01' AS DATE) AS   StartDate  
        UNION ALL 
    SELECT SNo+1 SNo,DATEADD(DAY,1,StartDate ) StartDate 
    FROM CTE WHERE DATEADD(Day,1,StartDate ) <= @DateTwo
)
SELECT StartDate [Date],SNo
INTO #AllDays
FROM CTE
OPTION(MAXRECURSION 0)

-- Data not truncated here.
SELECT ad.[Date]
    ,FORMAT(ad.[Date],'yyyy-MMM') [Month]
    ,ISNULL(d.TotalAmountIncome,0) TotalAmountIncome
    ,ISNULL(d.TotalAmountRefunded,0) TotalAmountRefunded
    ,ISNULL(d.ProductCostIncome,0) ProductCostIncome
    ,ISNULL(d.ProductCostRefunded,0) ProductCostRefunded
FROM  #DrillThroughData d
RIGHT JOIN #AllDays ad
    ON d.[Date] = ad.Date
ORDER BY SNo
FOR JSON AUTO


SET @DrillThroughData = (SELECT ad.[Date]
    ,FORMAT(ad.[Date],'yyyy-MMM') [Month]
    ,ISNULL(d.TotalAmountIncome,0) TotalAmountIncome
    ,ISNULL(d.TotalAmountRefunded,0) TotalAmountRefunded
    ,ISNULL(d.ProductCostIncome,0) ProductCostIncome
    ,ISNULL(d.ProductCostRefunded,0) ProductCostRefunded
FROM  #DrillThroughData d
RIGHT JOIN #AllDays ad
    ON d.[Date] = ad.Date
ORDER BY SNo
FOR JSON AUTO)

-- Data is being Truncated even though the varaible is nvarchar(max)
SELECT @DrillThroughData

未被截断时json的实际长度为88441，但被截断为13680

---

提前感谢。

这似乎是ssms的一个限制。检查此项答案：可能的重复项您可以随时检查内容的长度（以字节为单位）：选择datalength@DrillThroughData;感谢@TheGameiswar，这是SSMS的一个限制，我将在应用程序中获取完整数据。可能重复