sql - Dynamically create ranges from numeric sequences -


i have table following:

+----+-----+-----+ | id | grp | nr  | +----+-----+-----+ |  1 | 1   | 101 | |  2 | 1   | 102 | |  3 | 1   | 103 | |  4 | 1   | 105 | |  5 | 1-2 | 106 | |  6 | 1-2 | 109 | |  7 | 1-2 | 110 | |  8 | 2   | 201 | |  9 | 2   | 202 | | 10 | 3   | 300 | | 11 | 3   | 350 | | 12 | 3   | 351 | | 13 | 3   | 352 | +----+-----+-----+

i wanted create view groups list grp , concatenates values in nr. possible dynamically detect sequences , shorten them ranges? 1, 2, 3, 5 become 1-3, 5.

so result should this:

+-----+--------------------+ | grp |        nrs         | +-----+--------------------+ | 1   | 101 - 103, 105     | | 1-2 | 106, 109 - 110     | | 2   | 201 - 202          | | 3   | 300, 350 - 352     | +-----+--------------------+

what got concatenate values, table above become this:

+-----+--------------------+ | grp |        nrs         | +-----+--------------------+ | 1   | 101, 102, 103, 105 | | 1-2 | 106, 109, 110      | | 2   | 201, 202           | | 3   | 300, 350, 351, 352 | +-----+--------------------+

here's actual statement:

declare @t table (     id int identity(1, 1)   , grp varchar(10)   , nr int ) insert @t values ('1',101),('1',102),('1',103),('1',105)       ,('1-2',106),('1-2',109), ('1-2',110)       ,('2',201),('2',202)       ,('3',300),('3',350),('3',351),('3',352)  select * @t  ;with groupnums (rn, grp, nr, nrs)  (     select 1, grp, min(nr), cast(min(nr) varchar(max))      @t     group grp      union      select ct.rn + 1, t.grp, t.nr, ct.nrs + ', ' + cast(t.nr varchar(max))     @t t     inner join groupnums ct on ct.grp = t.grp      t.nr > ct.nr ) select nrs.grp, nrs.nrs groupnums nrs inner join (     select grp, max(rn) mrn      groupnums      group grp ) r on nrs.rn = r.mrn , nrs.grp = r.grp order nrs.grp

can tell me if it's possible that? great if has idea , share it.

please check try:

declare @t table (     id int identity(1, 1)   , grp varchar(10)   , nr int ) insert @t values ('1',101),('1',102),('1',103),('1',105)       ,('1-2',106),('1-2',109), ('1-2',110)       ,('2',201),('2',202)       ,('3',300),('3',350),('3',351),('3',352)  select * @t  ;with t1 (     select grp, nr, row_number() over(order grp, nr) id @t ) ,t (     select *, 1 cnt t1 id=1     union     select b.*, (case when t.nr+1=b.nr , t.grp=b.grp t.cnt                          else t.cnt+1 end)     t1 b inner join t on b.id=t.id+1 ) , tn as(     select *,          min(nr) over(partition grp, cnt) minval,          max(nr) over(partition grp, cnt) maxval     t ) select grp, stuff(     (select distinct ','+(case when minval=maxval cast(minval nvarchar(10)) else cast(minval nvarchar(10))+'-'+cast(maxval nvarchar(10)) end)        tn b b.grp=a.grp         xml path(''),type).value('.','nvarchar(max)'),1,1,'') [account names] tn group grp

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