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Informix Dynamic Server (IDS) Data Types - NVARCHAR
Versions: Informix Dynamic Server 11.x, 10.x, 9.x and 7.x
Infromix - NVARCHAR | |
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Syntax | NVARCHAR[(n [,r])] |
Data | Variable-length character data, single-byte and multibyte character sets |
Parameters | n is the maximum number of bytes, r is the minimum number of bytes reserved for column |
Range | 1 ⇐ n ⇐ 255, 0 ⇐ r ⇐ n |
Default | n is 1, r is 0 |
Padding | Not right-padded with spaces to n |
Trailing Spaces | Not removed when the value is stored and retrieved |
Storage Size | Actual entry length |
Notes | The main difference between NVARCHAR and VARCHAR is the collation order |
Standards | ANSI SQL |
Example:
CREATE TABLE t_nvarchar (c1 NVARCHAR(30,1));
Informix NVARCHAR - Equivalents in Other Databases
Database | Data Type and Conversion |
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Oracle | NVARCHAR(n), 1 ⇐ n ⇐ 4000/charsize |
SQL Server | NVARCHAR(n | max), 1 ⇐ n ⇐ 8000, 2G if max is specified |
MySQL | NVARCHAR(n), 1 ⇐ n ⇐ 21845, Unicode - UTF-8 |
PostgreSQL | VARCHAR(n), 1 ⇐ n ⇐ 1G |
Sybase ASE | NVARCHAR(n), 1 ⇐ n ⇐ pagesize/@@ncharsize (page size is 2K, 4K, 8K or 16K); UNIVARCHAR(n), 1 ⇐ n ⇐ pagesize/@@unicharsize, Unicode |
HP Neoview | NVARCHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns) |
Ingres | NVARCHAR(n), 1 ⇐ n ⇐ 16000, Unicode - UTF-8 |
Related Data Types in Informix
Data Types | |||
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Fixed-length Character Data | CHAR(n) | NCHAR(n) | |
Variable-length Character Data | VARCHAR(n,r) | LVARCHAR(n) | |
Character Large Objects | TEXT | CLOB |
All Data Types