Need help in mssql query

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Hello all, I want to save Korean Language in my MS Sql server table. but when i execute my procedure it save value like '???????' this. here is my sample code:-

alter PROCEDURE [dbo].[testsp]
	(	
		@Name	nvarchar(4000)
    )
AS

BEGIN

	SET NOCOUNT ON;

   INSERT INTO  dbo.tbl_test(testcolumn)

  VALUES (  @Name)

end

exicution code:-

exec [dbo].[testsp] @Name='안녕하세요'

and it save '????' question marks in my table column. can any one suggest me the solution.

What I have tried:

i search on google and got only one solution that use 'N' in your insert query. This solution working fine if i am using this like:-

alter PROCEDURE [dbo].[testsp]
	(	
		@Name	nvarchar(4000)
    )
AS

BEGIN

	SET NOCOUNT ON;

	set @Name=N'안녕하세요'

   INSERT INTO  dbo.tbl_test(testcolumn)

  VALUES (  @Name)

end

But i want to insert this value from my parameter which i passed in procedure.

Posted 8-Mar-21 20:23pm

TCS54321

Updated 8-Mar-21 20:45pm

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OriginalGriff · Accepted Answer · 2021-03-08T20:45:00

The "N" string prefix indicates that the string contains Unicode data:

'ABCDE'    Is ASCII data
N'ABCDE'   Is Unicode data

Similarly, the "N" in NVARCHAR indicates it is Unicode, without it the VARCHAR column is ASCII.
Your SP knows about and expects Unicode data, so it saves Unicode - but when you execute the procedure you have to hand it a Unicode string not an ASCII string.

So if your executing code passes a fixed Korean language string:

MS SQL 서버 테이블에 한국어를 저장하고 싶습니다.

Then it needs to be created with the Unicode prefix:

SQL

CALL MyStoredProcedure(N'MS SQL 서버 테이블에 한국어를 저장하고 싶습니다.')

Because if you don't, then it will pass an ASCII string and you will see "????" in your DB as a result:

SQL

CALL MyStoredProcedure('MS SQL 서버 테이블에 한국어를 저장하고 싶습니다.')

When you pass data to SQL from a presentation language such as C#, it will default to Unicode but other languages may use ASCII by default (for example, C)