Jeremy Stein - Brain

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SQL Server recursive join

SQL Server 2000 does not support recursive joins. Oracle’s PL/SQL has the “connect by” mechanism, but T-SQL has nothing. So, here’s a way to get all the IDs of the descendants into a table variable. Assume a table MyTable has id and parent_id. Modify to meet your needs:

declare @descendant table
  (id int, depth int)
declare @depth int
declare @cnt int

set @depth = 0

insert into @descendant
select id, @depth
from MyTable
where id = @initial_id --set this above
set @cnt = @@rowcount

while @cnt > 0
  set @depth = @depth + 1
  insert into @descendant
  select, @depth
  from MyTable
  inner join @descendant descendant
    on = MyTable.parent_id
  where descendant.depth = @depth - 1
  set @cnt = @@rowcount

April 10, 2006 No Comments.

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