如何在SQL中的两个特殊字符之间提取字符串

Question

如何编写TSQL脚本以从“Email_Monday_Miami_June”中获取“Monday_Miami”

基本上，我想提取第1和第3个“_”

之间的所有内容

万分感谢

Answer 1

DECLARE @c varchar(100)
SET     @c = 'Email_Monday_Miami_June' 

SELECT SUBSTRING(
    @c, 
    CHARINDEX('_', @c) + 1, 
    LEN(@c) - CHARINDEX('_', @c) - CHARINDEX('_', REVERSE(@c))
)

返回

Monday_Miami

Answer 2

declare @s varchar(max) = 'Email_Monday_Miami_June'

select parsename(replace(@s, '_', '.'), 3)+'_'+parsename(replace(@s, '_', '.'), 2)