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MySQL Tutorial - Difference between CHAR and NCHAR

By: FYIcenter.com

(Continued from previous topic...)

What Are the Differences between CHAR and NCHAR?

Both CHAR and NCHAR are fixed length string data types. But they have the following differences:

  • CHAR's full name is CHARACTER.
  • NCHAR's full name is NATIONAL CHARACTER.
  • By default, CHAR uses ASCII character set. So 1 character is always stored as 1 byte.
  • By default, NCHAR uses Unicode character set. NCHAR data are stored in UTF8 format. So 1 character could be stored as 1 byte or upto 4 bytes.
  • Both CHAR and NCHAR columns are defined with fixed lengths in units of characters.

The following column definitions are the same:

CREATE TABLE faq (Title NCHAR(80));
CREATE TABLE faq (Title NATIONAL CHAR(80));
CREATE TABLE faq (Title NATIONAL CHARACTER(80));
CREATE TABLE faq (Title CHAR(80) CHARACTER SET utf8);
CREATE TABLE faq (Title CHARACTER(80) CHARACTER SET utf8);

(Continued on next topic...)

  1. What Is SQL Standard?
  2. How Many Groups of Data Types?
  3. What Are Character String Data Types?
  4. What Are the Differences between CHAR and NCHAR?
  5. What Are the Differences between CHAR and VARCHAR?
  6. What Are the Differences between BINARY and VARBINARY?
  7. What Are Numeric Data Types?
  8. What Are Date and Time Data Types?
  9. How To Calculate Expressions with SELECT Statements?
  10. How To Include Comments in SQL Statements?
  11. How To Include Character Strings in SQL statements?
  12. How To Escape Special Characters in SQL statements?
  13. How To Concatenate Two Character Strings?
  14. How To Include Numeric Values in SQL statements?
  15. How To Enter Characters as HEX Numbers?
  16. How To Enter Numeric Values as HEX Numbers?
  17. How To Enter Binary Numbers in SQL Statements?
  18. How To Enter Boolean Values in SQL Statements?
  19. What Are NULL Values?
  20. What Happens If NULL Values Are Involved in Expressions?
  21. How To Convert Numeric Values to Character Strings?
  22. How To Convert Character Strings to Numeric Values?
  23. How To Use IN Conditions?
  24. How To Use LIKE Conditions?
  25. How To Use Regular Expression in Pattern Match Conditions?
  26. How To Use CASE Expression?

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