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Difference between datatype char(n),varchar(n),nchar(n),nvarchar(n) in sql server?

A char datatype takes 1 byte per character. It is a fixed length character datatype i.e even though character entered are less than n,fixed memory size i.e n bytes are allocated to those characters.
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use-unicode-native-format-to-import-or-export-data-sql-server.md

Unicode native format is helpful when information must be copied from one [!INCLUDE[msCoName](../../includes/msconame-md.md)] [!INCLUDE[ssNoVersion](../../includes ...
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zgstumpf/sql-server-invalidstring

Without proper checks, here are some "null" strings that can enter your database and introduce errors in your applications or data analytics: An empty string. May appear if the application user ...
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Decoding the VARCHAR and N Prefix in Databases: A Comparative Analysis of SQL Server and PostgreSQL

In the world of relational databases, VARCHAR is one of the most commonly used string data types, primarily used for storing variable-length character data. However, for many beginners, the ...
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Integer to Character Conversion in SQL

SQL is a widely-used programming language for computer databases in business. Frequently, software developers need to combine different kinds of data, such as integer and character fields, into a ...
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Differences in VARCHAR Across Different Databases and Rules for Using the 'N' Prefix in String Queries

In relational databases, VARCHAR is one of the most commonly used string data types for storing variable-length character data. For users who are unfamiliar, the differences in VARCHAR across ...