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SQL Server FAQ - NCHAR and NVARCHAR - Unicode Character String Data Types

By: FYIcenter.com

(Continued from previous topic...)

What Are Unicode Character String Data Types?

Unicode character string data types are used to store Unicode character strings. SQL Server 2005 supports the following Unicode character string data types:

  • NCHAR - Unicode character strings with a fixed length of n characters defined as NCHAR(n). The maximum length is 4,000 characters. NCHAR has two synonyms of NATIONAL CHAR and NATIONAL CHARACTER.
  • VARCHAR - Unicode character strings with a variable length of n characters defined as VARCHAR(n). The maximum length is 4,000 characters. NVARCHAR has two synonyms of NATIONAL CHAR VARYING and NATIONAL CHARACTER VARYING. NVARCHAR also has special form as NVARCHAR(MAX), which can store up to 2^31-1 bytes.
  • NTEXT - Unicode character strings with a variable length up to 2^31-1 (2,147,483,647) bytes. NTEXT is equivalent to NVARCHAR(MAX). NTEXT has a synonym of NATIONAL TEXT.

(Continued on next topic...)

  1. What Is SQL Language?
  2. What Is Transact-SQL Language?
  3. What Is a Transact-SQL Statement?
  4. How To Start and End Transact-SQL Statements?
  5. How To Enter Comments in Transact-SQL Statements?
  6. What Is a Transact-SQL Statement Batch?
  7. What Happens to a Statement Batch If There Is a Compilation Error?
  8. How To Use GO Command in "sqlcmd"?
  9. How To Create User Messages with PRINT Statements?
  10. How Many Categories of Data Types Used by SQL Server?
  11. What Are Exact Numeric Data Types?
  12. What Are Approximate Numeric Data Types?
  13. What Are Date and Time Data Types?
  14. What Are Character String Data Types?
  15. What Are Unicode Character String Data Types?
  16. What Are Binary String Data Types?
  17. What Are the Differences between CHAR and NCHAR?
  18. What Are the Differences between CHAR and VARCHAR?
  19. What Are the Differences between DECIMAL and FLOAT?

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