【11g】NLS_SORT（_CI附加，_AI附加）

NLS_SORT

NLS_SORT属性指示用于语言比较的排序序列。它接受“受支持的语言排序”中列出的值。可以将所有这些值修改为不区分大小写的排序，方法是将_CI附加到值中。若要执行不区分上下文和大小写的排序，请将_AI追加到该值。

对于物化视图和缓存组，TimesTen建议使用NLSSORT SQL函数显式指定排序序列，而不是在连接字符串或DSN定义中使用此属性

涉及字符比较的操作支持区分大小写的语言排序序列。不区分大小写的排序可能会影响对distinct值的解释。

NLS_SORT may affect many operations. The supported operations that are sensitive to collating sequence are:

• MIN, MAX

• BETWEEN

• =, <>, >, >=, <, <=

• DISTINCT

• CASE

• GROUP BY

• HAVING

• ORDER BY

• IN

• LIKE

Only BINARY sort is supported with the TIMESTEN8 character set.

NLS_SORT settings other than BINARY may have significant performance impact on character operations.

Note:

主键索引总是基于二进制排序序列。使用非二进制NLS_SORT等同性搜索不能使用主键索引

Required privilege

No privilege is required to change the value of this attribute.

Setting

Set NLS_SORT as follows:

Where to set the attribute	How the attribute is represented	Setting
C or Java programs or UNIX odbc.ini file	NLS_SORT	Specify the linguistic sort sequence or BINARY (default).
Windows ODBC Data Source Administrator	NLS_SORT dropdown list	Specify the linguistic sort sequence or BINARY (default).

 

Supported linguistic sorts

The tables in this section list the supported values for the NLS_SORT general connection attribute and the NLS_SORT SQL function.

只用一种语言的Monolingual linguistic sorts

Basic name	Extended name
ARABIC	-
ARABIC_MATCH	-
ARABIC_ABJ_SORT	-
ARABIC_ABJ_MATCH	-
ASCII7	-
AZERBAIJANI	XAZERBAIJANI
BENGALI	-
BIG5	-
BINARY	-
BULGARIAN	-
CANADIAN FRENCH	-
CATALAN	XCATALAN
CROATIAN	XCROATIAN
CZECH	XCZECH
CZECH_PUNCTUATION	XCZECH_PUNCTUATION
DANISH	XDANISH
DUTCH	XDUTCH
EBCDIC	-
EEC_EURO	-
EEC_EUROPA3	-
ESTONIAN	-
FINNISH	-
FRENCH	XFRENCH
GERMAN	XGERMAN
GERMAN_DIN	XGERMAN_DIN
GBK	-
GREEK	-
HEBREW	-
HKSCS	-
HUNGARIAN	XHUNGARIAN
ICELANDIC	-
INDONESIAN	-
ITALIAN	-
LATIN	-
LATVIAN	-
LITHUANIAN	-
MALAY	-
NORWEGIAN	-
POLISH	-
PUNCTUATION	XPUNCTUATION
ROMANIAN	-
RUSSIAN	-
SLOVAK	XSLOVAK
SLOVENIAN	XSLOVENIAN
SPANISH	XSPANISH
SWEDISH	-
SWISS	XSWISS
THAI_DICTIONARY	-
TURKISH	XTURKISH
UKRAINIAN	-
UNICODE_BINARY	-
VIETNAMESE	-
WEST_EUROPEAN	XWEST_EUROPEAN

使用多种语言的Multilingual linguistic sorts

Sort name	Description
CANADIAN_M	Canadian French sort supports reverse secondary, special expanding characters.
DANISH_M	Danish sort supports sorting uppercase characters before lowercase characters.
FRENCH_M	French sort supports reverse sort for secondary.
GENERIC_M	Generic sorting order which is based on ISO14651 and Unicode canonical equivalence rules but excluding compatible equivalence rules.
JAPANESE_M	Japanese sort supports SJIS character set order and EUC characters which are not included in SJIS.
KOREAN_M	Korean sort Hangul characters are based on Unicode binary order. Hanja characters based on pronunciation order. All Hangul characters are before Hanja characters.
SPANISH_M	Traditional Spanish sort supports special contracting characters.
THAI_M	Thai sort supports swap characters for some vowels and consonants.
SCHINESE_RADICAL_M	Simplified Chinese sort is based on radical as primary order and number of strokes order as secondary order.
SCHINESE_STROKE_M	Simplified Chinese sort uses number of strokes as primary order and radical as secondary order.
SCHINESE_PINYIN_M	Simplified Chinese Pinyin sorting order.
TCHINESE_RADICAL_M	Traditional Chinese sort based on radical as primary order and number of strokes order as secondary order.
TCHINESE_STROKE_M	Traditional Chinese sort uses number of strokes as primary order and radical as secondary order. It supports supplementary characters.