nvarchar[n] 类型的数据如何存储？

Question

If I create a table like this

CREATE TABLE [dbo].[Car]
(
    [Car_ID] [varchar](20) NOT NULL,
    [Car_CODE] [nvarchar](20) NULL,
    [Car_NAME] [nvarchar](50) NULL,
)

Does Car_Name have a maximum of 50 characters?

Say I give an input like this

"Teslaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" 

(60 chars), will it be stored as

"Teslaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" 

(50 chars)? Can someone help me with this? Thank you very much

Answer 1

If you try to insert or update a value greater than the column length by a query or Entity Framework, you'll get an error:

String or binary data would be truncated

If you use a stored procedure, the truncation will be done automatically and no error will occur.

Answer 2

The information is not inserted, it gives you an error

String or binary data would be truncated

Answer 3

The way I see your post raises two questions and therefore two answers.

1. How is nvarchar stored?

Data type nvarchar will store 2 bytes per character whereas varchar only 1 byte.

2. Will my nvarchar accept more chars than the maximum permitted?

No. The INSERT statement will fail and you'll be getting an error since it accepts only <= 50 chars.