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MySQL Data Types - CHAR
Versions: MySQL 5.x, 4.x and 3.23
| MySQL - CHAR | |
|---|---|
| Syntax | CHAR[(n)] [CHARACTER SET charset | BINARY | ASCII | UNICODE | BYTE] [COLLATE collate] |
| Data | Fixed-length character data, single-byte and multibyte character sets |
| Parameters | n is the maximum number of characters, optional. CHARACTER SET specifies the character set, COLLATE specifies a collation for the character set. ASCII is equal to CHARACTER SET latin1, UNICODE is equal to CHARACTER SET ucs2, BINARY is equal to specifying the binary collation; CHAR BYTE is a synonym for the BINARY data type |
| 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 |
| Internals | If CHARACTER SET binary is specified, it is automatically converted to the BINARY data type without warning |
| Version Differences | MySQL 4.1 and later - CHARACTER SET and COLLATE options are available. MySQL 3.23 and earlier - 1 ⇐ n ⇐ 255 |
| Synonyms | CHARACTER |
| Standards | ANSI SQL |
MySQL CHAR - Equivalents in Other Databases
| Database | Data Type and Conversion |
|---|---|
| Oracle | CHAR(n), 1 ⇐ n ⇐ 2000/charsize |
| SQL Server | CHAR(n), 1 ⇐ n ⇐ 8000 |
| IBM DB2 | CHAR(n), 1 ⇐ n ⇐ 254 |
| PostgreSQL | CHAR(n), 1 ⇐ n ⇐ 1G |
| Sybase ASE | CHAR(n), 1 ⇐ n ⇐ pagesize (2K, 4K, 8K or 16K) |
| Sybase ASA | CHAR(n), 1 ⇐ n ⇐ 32767/charsize |
| Informix | CHAR(n), 1 ⇐ n ⇐ 32767 |
| Teradata | CHAR(n), 1 ⇐ n ⇐ 64000/charsize |
| HP Neoview | CHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns) |
| Interbase/Firebird | CHAR(n), 1 ⇐ n ⇐ 32767/charsize |
| Ingres | CHAR(n), 1 ⇐ n ⇐ 3200 |
Related Data Types in MySQL
| Data Types | |||||
|---|---|---|---|---|---|
| Fixed-length character data | NCHAR(n) | ||||
| Variable-length character data | VARCHAR(n) | NVARCHAR(n) | TINYTEXT | TEXT | MEDIUMTEXT |
| Character large objects | LONGTEXT | ||||
All Data Types