CREATE FUNCTION fnDescriptionClean 
(@strDescription varchar(50))
RETURNS varchar(50)
AS
BEGIN

declare @Return varchar(50)
declare @badword varchar(50)

set @badword = 'Front'
set @strDescription = CASE 

--Remove from mid string

WHEN @strDescription LIKE '% ' + @Badword +' %'  THEN REPLACE(@strDescription,' ' +  @Badword + ' ',' ')

--Remove from start of string

WHEN @strDescription LIKE @Badword +' %' THEN RIGHT(@strDescription,(len(@strDescription)-(len(@Badword)+1)))

--Remove from end of string

WHEN @strDescription LIKE '% ' + @Badword THEN LEFT(@strDescription,(len(@strDescription)-(len(@Badword)+1)))
ELSE @strDescription END 

set @badword = 'Right'
set @strDescription = CASE 

WHEN @strDescription LIKE '% ' + @Badword +' %'  THEN REPLACE(@strDescription,' ')
WHEN @strDescription LIKE @Badword +' %' THEN RIGHT(@strDescription,(len(@strDescription)-(len(@Badword)+1)))
WHEN @strDescription LIKE '% ' + @Badword THEN LEFT(@strDescription,(len(@strDescription)-(len(@Badword)+1)))
ELSE @strDescription END 

RETURN      @strDescription
end

我是sql编程的新手,希望对此有所改进.假设我想要一个包含“坏词”列表的表,我想从字符串中删除它并在清理描述时循环遍历它.

我应该指出,这个过程需要尽可能高效,因为我处理的是1500万条记录.