正则表达式仅在SQL中验证前两个字符

Question

我要求检查一个值是否仅包含前两个字符中的字母D，F，I，Q，U或V

在SQL中，我尝试过

LIKE '[DFIQUV][DFIQUV]%'

没有运气。它不验证第二个字符是否是所列字符之一（适用于第一个字符）

我做错了什么？

Answer 1

分开检查前两个字符的每一个：

WHERE (COL LIKE '[DFIQUV]%' OR COL LIKE '_[DFIQUV]%')

Answer 2

如果我理解正确，你需要这样的东西：

create table #a(col varchar(10))

insert #a(col)
select 'ABC' union all
select 'EFG' union all
select 'DFI' union all
select 'QUV'

--unnecessary rows
select * from #a where col not like '[DFIQUV][DFIQUV]%' --1st version (means 'and' condition between two letters)
select * from #a where col not like '[DFIQUV]%' or col like '_[DFIQUV]%' --correct version (manually 'or' condition)

--necessary rows
select * from #a where col not like '[DFIQUV]%' and col not like '_[DFIQUV]%'