如何建立一個表的字段值的所有連續在SQL Server

Question

如何建立在SQL Server 表字段值的所有順序我也有類似的表這個

 
a 
b 
b 
c 
d 
f 

我需要一個功能，該表具有類似的輸出

 
a 
ab 
abb 
abbc 
abbcd 
abbdcf 

假設我有訂購這些項目的ID。

Answer 1

假設你有一個訂購的項目一個（無間隙，增大）ID：

with tree (id, all_items) as (
    select id, cast(data as varchar(max)) as all_items 
    from foo 
    where id = 1 

    union all 

    select c.id, p.all_items + c.data 
    from foo c 
    join tree p on p.id = c.id - 1 
) 
select all_items 
from tree 

SQLFiddle例如：http://www.sqlfiddle.com/#!3/8840c/1

Answer 2

Declare @Temp Table 
(
    Id Int Identity(1,1), 
    Data Varchar(1) 
) 
Insert Into @Temp(Data) Values ('a') 
Insert Into @Temp(Data) Values ('b') 
Insert Into @Temp(Data) Values ('b') 
Insert Into @Temp(Data) Values ('c') 
Insert Into @Temp(Data) Values ('d') 
Insert Into @Temp(Data) Values ('f') 

Declare @i Int = 1, @j Int = 1,@Str Varchar(max) = '',@AllStr Varchar(max) = '' 
While(@i <= (Select MAX(Id) From @Temp)) 
Begin 
    While(@j <= @i) 
    Begin 
     Set @Str += (Select Data From @Temp Where Id = @j) 
     Set @j += 1 
    End 
    Print @str 
    Set @j = 1 
    Set @i += 1 
    Set @Str = '' 
End