SQL insert data? Resolution Method

Sometimes when we insert data into a table using insert, it will become ?, The decoding method is very simple. You only need to add n before the string.
For example
Insert into table (field) values ('data'); => insert into table (field) values (N'Number ');

N indicates Unicode, which is a double byte character.
For Western characters, one byte is enough. For Eastern characters, two bytes are required for storage.
To ensure consistency, standardization, convenience, and compatibility, Unicode requires that Spanish characters are also stored in two bytes.