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Versions: PostgreSQL 8.x and 7.x
| PostgreSQL - VARCHAR | |
|---|---|
| Syntax | VARCHAR[(n)] |
| Data | Variable-length character data, single-byte and multibyte character sets |
| Parameters | n is the maximum number of bytes, optional |
| Range | 1 ⇐ n ⇐ 1G |
| Default | n is 1G |
| Padding | Not right-padded with spaces to n |
| Trailing Spaces | Not removed when the value is stored and retrieved. Trailing spaces are significant in comparison. |
| Character Set | Database default |
| Error Handling | Exceeding data truncated to the maximum length if the excess characters are all spaces, otherwise an error is raised. Casting to a shorter length truncates the value without raising an error. |
| Storage Size | actual entry length |
| Synonyms | CHARACTER VARYING |
| Standards | ANSI SQL |
PostgreSQL VARCHAR - Equivalents in Other Databases
| Database | Data Type and Conversion |
|---|---|
| Oracle | VARCHAR2(n), 1 ⇐ n ⇐ 4000/charsize; NVARCHAR2(n), 1 ⇐ n ⇐ 4000/charsize, Unicode - UTF-8 or UTF-16 |
| SQL Server | VARCHAR(n | max), 1 ⇐ n ⇐ 8000, 2G if max is specified |
| MySQL | VARCHAR(n), 1 ⇐ n ⇐ 65535/charsize; NVARCHAR(n), 1 ⇐ n ⇐ 21845, Unicode - UTF-8 |
| Sybase ASE | VARCHAR(n), 1 ⇐ n ⇐ pagesize (2K, 4K, 8K or 16K); NVARCHAR(n), 1 ⇐ n ⇐ pagesize/@@ncharsize; UNIVARCHAR(n), 1 ⇐ n ⇐ pagesize/@@unicharsize, Unicode |
| Informix | VARCHAR(n,r), 1 ⇐ n ⇐ 255, LVARCHAR(n), 1 ⇐ n ⇐ 32739, TEXT, 2G, CLOB, 4T |
| HP Neoview | VARCHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns) |
Related Data Types in PostgreSQL
| Data Types | |||
|---|---|---|---|
| Fixed-length character data | CHAR(n) | ||
| Variable-length character data | TEXT | ||
All Data Types
| Oracle | SQL Server | IBM DB2 | MySQL | PostgreSQL | Sybase ASE | Sybase ASA | Informix DS | Teradata | HP Neoview | Interbase/Firebird |
SQLWays Product Page - Migration to PostgreSQL
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