Sybase ASE Data Types - UNIVARCHAR

Versions: Sybase Adaptive Server Enterprise 15.x, 12.5.x, 12.0 and 11.x

Sybase ASE - UNIVARCHAR
Syntax	UNIVARCHAR[(n)]
Data	Variable-length character data, Unicode character set
Parameters	n is the maximum number of characters, optional
Range	1 ⇐ n ⇐ pagesize/@@unicharsize
Default	n is 1
Trailing Spaces	Removed when the value is stored
Empty String	“” is stored as a single space “ ”
Error Handling	Exceeding data truncated without warning if set string_rtruncation off specified (default), otherwise an error is raised
Storage Size	actual entry length * @@unicharsize
Synonyms	UNICODE CHAR VARYING, UNICODE CHARACTER VARYING
Standards	Sybase Transact-SQL Extension

Sybase ASE UNIVARCHAR - Equivalents in Other Databases

Database	Data Type and Conversion
Oracle	NVARCHAR2(n), 1 ⇐ n ⇐ 4000/charsize, Unicode - UTF-8 or UTF-16
SQL Server	NVARCHAR(n \| max), 1 ⇐ n ⇐ 4000, 2G if max is specified, Unicode - UCS-2
MySQL	NVARCHAR(n), 1 ⇐ n ⇐ 21845, Unicode - UTF-8
PostgreSQL	VARCHAR(n), 1 ⇐ n ⇐ 1G
Informix	VARCHAR(n,r), 1 ⇐ n ⇐ 255, LVARCHAR(n), 1 ⇐ n ⇐ 32739
HP Neoview	NVARCHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns)
Ingres	NVARCHAR(n), 1 ⇐ n ⇐ 16000, Unicode - UTF-8

Related Data Types in Sybase ASE

Data Types
Fixed-length character data	CHAR(n)	NCHAR(n)	UNICHAR(n)
Variable-length character data	VARCHAR(n)	NVARCHAR(n)
Character large objects	TEXT	UNITEXT

All Data Types

Oracle

SQL Server

IBM DB2

MySQL

PostgreSQL

Sybase ASE

Sybase ASA

Informix DS

Teradata

HP Neoview

Interbase/Firebird

Ingres