SQL Server 2008 VarChar（Max）は、8000文字のみを返します。どうして？

Question

PRINT Convert(VarChar(Max),Replicate('1234567890 ',1000)) 

これは、7,997文字のウィンドウに戻ります。

SELECT Convert(VarChar(Max),Replicate('1234567890 ',1000)) 

これはグリッド7,996文字に戻ります。印刷ウィンドウ内の余分な文字はCRLFです。 ツール→オプション→クエリ結果→結果 - テキスト→各列に表示される最大文字数= 8192

グリッドには8,192文字が返されます11,001文字が私のウィンドウに返されると期待しています。

は、このテストがあります：

DECLARE @VarCharMax VarChar(Max) 
SET @VarCharMax = Replicate('123456',2000) 
SELECT Right(@VarCharMax,3) -- returns 456 
SELECT Right(Left(@VarCharMax,8000),3) -- returns 456 
SELECT Right(Left(@VarCharMax,7999),3) -- returns 456 
SELECT Right(Left(@VarCharMax,7998),3) -- returns 456 
SELECT Right(Left(@VarCharMax,7997),3) -- returns 345 
SELECT Right(Left(@VarCharMax,7996),3) -- returns 234 

私はここで理解して何をしないのですか？私が期待するように全く行動しないようですね？

Answer 1

8000文字引数はvarchar型でない限りstring_expressionは、varchar型（最大）でない場合（最大）/ NVARCHAR（MAX）

https://msdn.microsoft.com/en-us/library/ms174383.aspx

複製機能の制限ですかnvarchar（max）、REPLICATEは8,000バイトで戻り値を切り捨てます。 8,000バイトを超える値を返すには、string_expressionを明示的に適切な大きい値のデータ型にキャストする必要があります。複製関数内

Answer 2

SELECT len(Replicate(cast('1234567890' as varchar(max)),1000)) 

Returns 10000 

Answer 3

あなたの '123456' テキストがvarchar（max）データ型ではありません。 expressionがvarchar（max）データ型でない場合、Duduはreplicate関数を8000文字の制限として述べました。

Answer 4

ドゥドゥはそれをはっきりと説明しました。下の文字列は9,060文字です。

DECLARE @VarCharMax VarChar(Max) 
SET @VarCharMax = 'This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!This is a test!' 
PRINT Right(@VarCharMax,3) -- returns st! 
PRINT Right(Left(@VarCharMax,8000),3) -- returns is 
PRINT Right(Left(@VarCharMax,7999),3) -- returns his 
PRINT Right(Left(@VarCharMax,7998),3) -- returns Thi 
PRINT Right(Left(@VarCharMax,7997),3) -- returns !Th 
PRINT Right(Left(@VarCharMax,7996),3) -- returns t!h 

これは私の予想どおりです。