Versions: Oracle 11g, 10g, 9i, 8i and 7.3
| Oracle - NVARCHAR2 | |
|---|---|
| Syntax | NVARCHAR2(n) |
| Data | Variable-length character data in Unicode - UTF-8 or UTF-16 |
| Parameters | n is the maximum number of characters |
| Range | 1 ⇐ n ⇐ 4000/charsize |
| Default | n is mandatory |
| Padding | Not right-padded with spaces to n |
| Trailing Spaces | Not removed when the value is stored and retrieved |
| Empty String | '' is treated as NULL |
| Error Handling | Error is raised if the value is too long |
| Storage Size | Actual entry length |
| Synonyms | NATIONAL VARCHAR, NATIONAL CHAR VARYING, NATIONAL CHARACTER VARYING |
| Standards | Oracle Extension |
Oracle NVARCHAR2 - Equivalents in Other Databases //z 2012-08-01 15:29:34 IS2120@CSDN.T630071441 [T11,L241,R3,V301]
| Database | Data Type and Conversion |
|---|---|
| SQL Server | NVARCHAR(n | max), 1 ⇐ n ⇐ 8000, 2G ifmax 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 |
| Informix | NVARCHAR(n,r), 1 ⇐ n ⇐ 255,LVARCHAR(n), 1 ⇐ n ⇐ 32739 |
| HP Neoview | NVARCHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns) |
Related Data Types in Oracle
| Data Types | |||
|---|---|---|---|
| Fixed-length Character Data | CHAR(n) | NCHAR(n) | |
| Variable-length Character Data | VARCHAR2(n) | ||
| Character Large Objects | CLOB | NCLOB | LONG |