Select and merge rows in a table in SQL Stored procedure

Question

Have a temp table with schema: ID | SeqNo | Name

ID - Not unique
SeqNo - Int (can be 1,2 or 3). Sort of ID+SeqNo as Primary key
Name - Any text

And sam

Answer 1

If SeqNo is limited to 1,2,3:

select id, a.name + coalesce('/'+b.name, '') + coalesce('/'+c.name, '')
from myTable a
left outer join myTable b on a.id=b.id and b.seqno = 2
left outer join myTable c on a.id=c.id and c.seqno = 3
where a.seqno = 1;

If SeqNo is open ended you can deploy a recursive cte:

;with anchor as (
   select id, name, seqno
      from myTable
      where seqno=1)
, recursive as (
   select id, name, seqno
      from anchor
      union all
   select t.id, r.name + '/' + t.name, t.seqno
      from myTable t
      join recursive  r on t.id = r.id and r.seqno+1 = t.seqno)
select id, name from recursive;