Connet by prior

Question

hi friends i have table like tree
table data;
id  parent id name type
1                   a       type1
2       1          b       type2
3       2          c       type1
4       3          d       type2 i can create tree from this table with connect by prior basicly
my problem is: i write query which give only type1 with again tree format
like this;
id  parent id name type
1                   a       type1
3     1         c       type1**** parent id be 1 in querry resulthow can we do it?
thanks

Answer 1

Hi,
You can try this:
SQL> with t as (
  2  select 1 cid, null pid, 'a' aname, 'type1' atype from dual union all
  3  select 2,     1,        'b',       'type2' from dual union all
  4  select 3,     2,        'c',       'type1' from dual union all
  5  select 4,     3,        'd',       'type2' from dual
  6  )
  7  select cid
  8  ,      substr(path_pid, 1, instr(path_pid, '/')-1) ppid
  9  ,      aname
10  ,      atype
11  from  ( select cid
12          ,      pid
13          ,      ltrim(sys_connect_by_path(pid, '/'), '/') path_pid
14          ,      aname
15          ,      atype
16          ,      level
17          from   t
18          start with cid=1
19          connect by prior cid = pid
20        )
21  where atype = 'type1';
       CID PP A ATYPE
         1    a type1
         3 1  c type1