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Oracle Data Types - VARCHAR2

Versions: Oracle 11g, 10g, 9i, 8i and 7.3

Oracle - VARCHAR2
Syntax VARCHAR2(n [CHAR | BYTE])
Data Variable-length character data, single-byte and multibyte character sets
Parameters n is the maximum number of bytes if BYTE is specified (default, defined by NLS_LENGTH_SEMANTICS) or characters if CHAR is specified
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
Character Set Database default
Empty String '' is treated as NULL
Error Handling Error is raised if the value is too long
Storage Size Actual entry length
Version Differences Oracle 9i - CHAR and BYTE qualifiers added
Standards Oracle Extension

Oracle VARCHAR2 - Equivalents in Other Databases

Database Data Type and Conversion
SQL Server VARCHAR(n | max), 1 ⇐ n ⇐ 8000, 2G if max is specified
MySQL VARCHAR(n), 1 ⇐ n ⇐ 65535/charsize
PostgreSQL VARCHAR(n), 1 ⇐ n ⇐ 1G
Sybase ASE VARCHAR(n), 1 ⇐ n ⇐ pagesize (2K, 4K, 8K or 16K)
Informix VARCHAR(n,r), 1 ⇐ n ⇐ 255, LVARCHAR(n), 1 ⇐ n ⇐ 32739
HP Neoview VARCHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns)
Ingres VARCHAR(n), 1 ⇐ n ⇐ 32000

Related Data Types in Oracle

Data Types
Fixed-length Character Data CHAR(n) NCHAR(n)
Variable-length Character Data NVARCHAR2(n)
Character Large Objects CLOB NCLOB LONG

All Data Types

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