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Why Use the 'N' Prefix in T-SQL Strings?

Patricia Arquette

Jan 23, 2025 am 07:47 AM

Why Use the 'N' Prefix in T-SQL Strings?

Understanding the 'N' Prefix in T-SQL Strings

In T-SQL, you'll often encounter the 'N' prefix before strings. This isn't just a stylistic choice; it's crucial for proper string data handling.

The Role of the 'N' Prefix

The 'N' prefix designates a Unicode string, specifically of the nvarchar data type. nvarchar uses a broader character encoding than the standard varchar (which relies on the database's default code page).

When is the 'N' Prefix Necessary?

Using the 'N' prefix is essential when your strings contain characters outside the database's default code page. Unicode supports a vast range of characters, including those from various international languages and specialized symbols.

Consequences of Skipping the 'N' Prefix

Omitting the 'N' prefix can lead to unexpected character conversions. The string might be incorrectly translated to the database's default code page, resulting in data corruption or inaccurate display.

Illustrative Example

Observe this INSERT statement:

INSERT INTO Personnel.Employees
VALUES(N'29730', N'Philippe', N'Horsford', 20.05, 1)

Here, 'N' ensures that employee names are stored as nvarchar, preventing potential data loss or misrepresentation of characters.

In Summary

The 'N' prefix is vital for handling Unicode strings within T-SQL. Employing it consistently ensures accurate and reliable management of text data, especially in applications dealing with multiple languages.

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