LTRIM 和 RTRIM 精确修剪哪些字符?

What characters do LTRIM and RTRIM trim exactly?(LTRIM 和 RTRIM 精确修剪哪些字符?)

问题描述

LTRIM 和 RTRIM 记录在案以修剪空白".究竟哪些字符被视为空白"?

LTRIM and RTRIM are documented to trim "blanks". What characters are considered "blank" exactly?

推荐答案

好问题.尽管在 Unicode 中定义了许多空白字符，但只删除了一个空格 (0x0020):

Good question. Although there are many whitespace characters defined in Unicode, only a space (0x0020) is removed:

with Characters as (
  select NChar( 0 ) as Character
  union all
  select NChar( Unicode( Character ) + 1 )
    from Characters
    where Unicode( Character ) < 65535 ),
  CharacterMap as (
  select Unicode( Character ) as [UnicodePoint], Character,
    1 - Len( LTrim( Character ) ) as [Whitespace]
    from Characters )
  select UnicodePoint, Character, Whitespace
    from CharacterMap
    where Whitespace = 1
    option ( MaxRecursion 0 );

(同样适用于RTrim.)

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