Question

I’m looking for a query to get the following output:

Id Number
-- ------
 1 241100
 2 241110
 2 241111
 2 241112
 2 241113
 2 241114
 2 241115

Table strucutre:

Id Number From To
-- ------ ---- ----
 1 241100 NULL NULL
 2 241110  111  115

Rows without a from/to range has to return the number. The other ones have to return the number followed by SUBSTRING(Number, 1, 3) + <from/to range>

One possible solution would be using while-loops. But thats not the way I’d prefer. And it’s quite slow. And there’s no way to change the data structure. We query data from a third party supplier.

---

On application site I’ve a (very small) list of numbers such as ‘241113’, ‘241000’, … and need to know to which id this number is assigned to.

The query I will use to get a result is:

SELECT Id, Number FROM MyView WHERE Number IN ('241113', '241000')

Answer 1

The query I will use to get a result is:

SELECT Id, Number FROM MyView WHERE Number IN (‘241113’, ‘241000’)

This is how you can write that query instead. There is no need to generate the numbers.

declare @T table
(
  Id int,
  Number int,
  [From] int,
  [To] int
)

insert into @T values
(1, 241100, NULL, NULL),
(2, 241110,  111,  115)

select T.Id, V.Number
from @T as T
  inner join (values (241113), 
                     (241100)) as V(Number)
    on V.Number between T.Number and T.Number + isnull(T.[To], 0)

A version where you put the numbers you look for in a table variable instead.

declare @V table(Number int)
insert into @V values(241100)
insert into @V values(241113)

select T.Id, V.Number
from @T as T
  inner join @V as V
    on V.Number between T.Number and T.Number + isnull(T.[To], 0)

I have not used From anywhere because it is unclear to me what values is possible in that column other then null and number+1.

And a version where you generate the numbers before filtering them out. The result is the same and I believe performance is not as good.

;with C as
(
  select T.Id,
         T.Number
  from @T as T
  union all
  select T.Id,
         C.Number + 1
  from @T as T
    inner join C
      on C.Id = T.Id
  where stuff(C.Number, 1, 3, '') < T.[To]
)
select Id, Number
from C
where Number in ('241113', '241100')