如果正规空格没有被LTRM或RTRM删除，请尝试这样使用

LTRIM(RTRIM(REPLACE(REPLACE(REPLACE(Column_data, CHAR(9), ''), CHAR(10), ''), CHAR(13), '')))

简单地替换它;

SELECT REPLACE(fld_or_variable, ' ', '')

编辑: 澄清一下;它是一个全局替换，不需要trim()或担心char或varchar的多个空格:

create table #t (
    c char(8),
    v varchar(8))

insert #t (c, v) values 
    ('a a'    , 'a a'    ),
    ('a a  '  , 'a a  '  ),
    ('  a a'  , '  a a'  ),
    ('  a a  ', '  a a  ')

select
    '"' + c + '"' [IN], '"' + replace(c, ' ', '') + '"' [OUT]
from #t  
union all select
    '"' + v + '"', '"' + replace(v, ' ', '') + '"'
from #t 

结果

IN             OUT
===================
"a a     "     "aa"
"a a     "     "aa"
"  a a   "     "aa"
"  a a   "     "aa"
"a a"          "aa"
"a a  "        "aa"
"  a a"        "aa"
"  a a  "      "aa"

我分享一个解决方案，在我看来，它非常快，但安装起来有点繁琐。它在Microsoft SQL Server 2008 R2 (SP3)上工作得很好:

在数据库所在的服务器上安装Sql Regex程序集。安装步骤如下: https://github.com/DevNambi/sql-server-regex#installation 在数据库中创建函数dbo。TRIM，它基于RegexReplace()标量函数(https://github.com/DevNambi/sql-server-regex#replace):

CREATE FUNCTION [dbo].[TRIM](@text NVARCHAR(MAX))
  RETURNS NVARCHAR(MAX) --WITH SCHEMABINDING 
BEGIN

-- This function removes:
-- 1. invisible characters,
-- 2. repeated blank spaces and
-- 3. the spaces at the beginning and at the end of the text.

    RETURN (CASE
        WHEN @text is NULL 
            THEN NULL
        ELSE

            dbo.RegexReplace((dbo.RegexReplace(dbo.RegexReplace(@text, N'['+Nchar(0)+N'-'+Nchar(32)+Nchar(8192)+N'-'+Nchar(8202)+Nchar(160)+Nchar(5760)+Nchar(6158)+Nchar(8232)+Nchar(8233)+Nchar(8239)+Nchar(8287)+Nchar(65440)+Nchar(12288) +N']+', N'[}'), N'[\[\}]+', ' ')), N'^\s+|\s+$','')  

    END);
END
GO

....................

使用方法:

declare @txt NVARCHAR(MAX) = N' Hello,'+Nchar(12288)+N'          my      '+NCHAR(160)+N'name'+Nchar(0)+N'     is John'+NCHAR(11)+N'            Doe';

select dbo.TRIM(@txt) as Result -- Result: "Hello, my name is John Doe"

....................

更新:

要完全删除所有空格，您可以创建以下函数:

CREATE FUNCTION [dbo].[TRIM_SPACES](@text NVARCHAR(MAX))
  RETURNS NVARCHAR(MAX) --WITH SCHEMABINDING 
BEGIN
    RETURN (CASE WHEN @text is NULL THEN NULL ELSE
            dbo.RegexReplace(@text, N'['+Nchar(0)+N'-'+Nchar(32)+Nchar(8192)+N'-'+Nchar(8202)+Nchar(160)+Nchar(5760)+Nchar(6158)+Nchar(8232)+Nchar(8233)+Nchar(8239)+Nchar(8287)+Nchar(65440)+Nchar(12288) +N']+', N'')
    END)
END
GO

....................

使用方法:

declare @txt NVARCHAR(MAX) = N' Hello,'+Nchar(12288)+N'          my      '+NCHAR(160)+N'name'+Nchar(0)+N'     is John'+NCHAR(11)+N'            Doe';

select dbo.TRIM_SPACES(@txt) as Result -- Result: "Hello,mynameisJohnDoe"

取代()函数:

REPLACE(field, ' ', '')

如果正规空格没有被LTRM或RTRM删除，请尝试这样使用

LTRIM(RTRIM(REPLACE(REPLACE(REPLACE(Column_data, CHAR(9), ''), CHAR(10), ''), CHAR(13), '')))

替换特定字符的语法:

REPLACE ( string_expression , string_pattern , string_replacement )  

例如，在字符串“HelloReplaceThingsGoing”中，替换词被How替换

SELECT REPLACE('HelloReplaceThingsGoing','Replace','How');
GO