从我的字符串中提取最后两个单词

Question

我尝试从我的字符串中提取最后一个单词

例

输入字符串: GGG_FFFF_AAAA_BBBBBB_CCC_DDDDD

结果

??????????????????????????
? FIRST_COL ? SECOND_COL ?
??????????????????????????
? CCC       ? DDDDD      ?
??????????????????????????

我有下面的代码工作.

DECLARE @STR VARCHAR(50) = 'GGG_FFFF_AAAA_BBBBBB_CCC_DDDDD'

SELECT 
Reverse(LEFT(Stuff(Reverse(@STR), 1, Charindex('_', Reverse(@STR)) + 1 - 1, ''), Charindex('_', Stuff(Reverse(@STR), 1, Charindex('_', Reverse(@STR)) + 1 - 1, '')) - 1)) as FIRST_COL,
Reverse(LEFT(Reverse(@STR), Charindex('_', Reverse(@STR)) - 1)) as SECOND_COL

有没有更简单的实现这一点

Answer 1

您可以使用XML:

DECLARE @input nvarchar(max) = 'GGG_FFFF_AAAA_BBBBBB_CCC_DDDDD',
        @x xml

SELECT @x = CAST('<a>'+REPLACE(REVERSE(@input),'_','</a><a>')+'</a>' as xml)


SELECT  REVERSE(@x.value('/a[2]','nvarchar(max)')) as FIRST_COL,
        REVERSE(@x.value('/a[1]','nvarchar(max)')) as SECOND_COL

输出:

FIRST_COL   SECOND_COL
CCC         DDDDD