create function GetChildID(@ParentID int)
returns @t table(ID int)
as
begin
insert into @t select id from table where parent_id = @ParentID
while @@rowcount<>0
begin
insert into @t select a.id from table as a
inner join @t as b
on a.parent_id = b.ID
and not exists(select 1 from @t where ID=a.ID)
end
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