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MySQL Data Types - NCHAR
Versions: MySQL 5.x, 4.x and 3.23
MySQL - NCHAR | |
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Syntax | NCHAR[(n)] |
Data | Fixed-length character data in the predefined character set - UTF8 |
Parameters | n is the maximum number of characters, optional |
Range | 0 ⇐ n ⇐ 255 |
Default | n is 1 |
Padding | Right-padded with spaces to n |
Trailing Spaces | Removed when the value is retrieved if PAD_CHAR_TO_FULL_LENGTH SQL mode is not specified. Trailing spaces are insignificant in comparisons, primary and unique keys |
Empty String | CHAR(0) is allowed that can store 2 values: '' (empty string) and NULL |
Error Handling | Exceeding data truncated and a warning is generated if strict SQL mode is not enabled, otherwise in case of non-space characters truncation, an error is raised |
Storage Size | n bytes |
Notes | NCHAR is equivalent to CHAR CHARACTER SET UTF8 |
Synonyms | NATIONAL CHAR, NATIONAL CHARACTER |
Standards | ANSI SQL |
MySQL NCHAR - Equivalents in Other Databases
Database | Data Type and Conversion |
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Oracle | NCHAR(n), 1 ⇐ n ⇐ 2000/charsize, Unicode - UTF-8 or UTF-16 |
SQL Server | NCHAR(n), 1 ⇐ n ⇐ 4000, Unicode - UCS-2 |
IBM DB2 | GRAPHIC(n), 1 ⇐ n ⇐ 127, double-byte |
PostgreSQL | CHAR(n), 1 ⇐ n ⇐ 1G |
Sybase ASE | NCHAR(n), 1 ⇐ n ⇐ pagesize (2K, 4K, 8K or 16K), Character set - database default UNICHAR(n), 1 ⇐ n ⇐ pagesize, Unicode |
Sybase ASA | NCHAR(n), 1 ⇐ n ⇐ 8191, Unicode - UTF-8 |
Informix | NCHAR(n), 1 ⇐ n ⇐ 32767, database character set |
Teradata | CHAR(n), 1 ⇐ n ⇐ 64000/charsize |
HP Neoview | NCHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns), Unicode - UCS-2 or ISO88591 (Latin1) |
Interbase/Firebird | NCHAR(n), 1 ⇐ n ⇐ 32767, single-byte ISO8859_1 (Latin 1); CHAR(n), 1 ⇐ n ⇐ 32767, with CHARACTER SET UTF-8 |
Ingres | NCHAR(n), 1 ⇐ n ⇐ 16000, Unicode - UTF-8 |
Related Data Types in MySQL
Data Types | |||||
---|---|---|---|---|---|
Fixed-length character data | CHAR(n) | ||||
Variable-length character data | VARCHAR(n) | NVARCHAR(n) | TINYTEXT | TEXT | MEDIUMTEXT |
Character large objects | LONGTEXT |
All Data Types