本文介绍了LTRIM 和 RTRIM 精确修剪哪些字符?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
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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