SQL：如何在所有行中获取列中的所有不同的字符

在sql Server中是否有一种优雅的方法来查找所有行中的单个varchar(50)列中的所有不同的字符？

奖金积分,如果它可以做没有光标:)

例如,说我的数据包含3行：

productname
-----------
product1
widget2
nicknack3

字符的不同库存将是“productwigenka123”

解决方法

鉴于您的列是varchar,这意味着它只能存储代码0到255中的任何代码页的字符.如果只使用32-128 ASCII码范围,那么可以简单的看看你是否有任何一个字符32-128.以下查询确实如此,在sys.objects.name中查找：

with cteDigits as (
    select 0 as Number
    union all select 1 as Number
    union all select 2 as Number
    union all select 3 as Number
    union all select 4 as Number
    union all select 5 as Number
    union all select 6 as Number
    union all select 7 as Number
    union all select 8 as Number
    union all select 9 as Number),cteNumbers as (
    select U.Number + T.Number*10 + H.Number*100 as Number
    from cteDigits U
    cross join cteDigits T
    cross join cteDigits H),cteChars as (
    select CHAR(Number) as Char
    from cteNumbers 
    where Number between 32 and 128)
select cteChars.Char as [*]
from cteChars
cross apply (
    select top(1) *
    from sys.objects
    where CHARINDEX(cteChars.Char,name,0) > 0) as o
for xml path('');

原文地址：https://www.jb51.cc/mssql/81281.html