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Oracle Data Types - NVARCHAR2 (zz)

2012-08-01 15:26 489 查看
Versions: Oracle 11g, 10g, 9i, 8i and 7.3

Oracle - NVARCHAR2
SyntaxNVARCHAR2(n)
DataVariable-length character data in Unicode - UTF-8 or UTF-16
Parametersn is the maximum number of characters
Range1 ⇐ n ⇐ 4000/charsize
Defaultn is mandatory
PaddingNot right-padded with spaces to n
Trailing SpacesNot 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 SizeActual entry length
SynonymsNATIONAL VARCHAR, NATIONAL CHAR VARYING, NATIONAL CHARACTER VARYING
StandardsOracle Extension


Oracle NVARCHAR2 - Equivalents in Other Databases //z 2012-08-01 15:29:34 IS2120@CSDN.T630071441 [T11,L241,R3,V301]



DatabaseData Type and Conversion
SQL ServerNVARCHAR(n | max), 1 ⇐ n ⇐ 8000, 2G ifmax is specified
MySQLNVARCHAR(n), 1 ⇐ n ⇐ 21845, Unicode - UTF-8
PostgreSQLVARCHAR(n), 1 ⇐ n ⇐ 1G
Sybase ASENVARCHAR(n), 1 ⇐ n ⇐ pagesize/@@ncharsize (page size is 2K, 4K, 8K or 16K);UNIVARCHAR(n),
1 ⇐ n ⇐ pagesize/@@unicharsize, Unicode
InformixNVARCHAR(n,r), 1 ⇐ n ⇐ 255,LVARCHAR(n),
1 ⇐ n ⇐ 32739
HP NeoviewNVARCHAR(n), 1 ⇐ n ⇐ (32708 - size of other columns)
Related Data Types in Oracle

Data Types
Fixed-length Character DataCHAR(n)NCHAR(n)
Variable-length Character DataVARCHAR2(n)
Character Large ObjectsCLOBNCLOBLONG
//z 2012-08-01 15:29:34 IS2120@CSDN.T630071441 [T11,L241,R3,V301]
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