application of the hierarchy with the dynamic start condition

Hello

I have a table that stores line items (foohierarchy) and other storage users and items (useritems). Unfortunately, it is not consistent and is missing some entries. I would like to correct this using pure sql. Fixing here means that a user who has a certain child element must also have parents of this child. However, there are a few obstacles here. First the hierarchy table does not explicitly which elements are higher level items. I'm trying to fix this by emulating an adequate structure and named this fixedhierarchy. A select statement that returns only designed relations users/article would be nice.
Here a few visualization and sample data, sample data follows the model that each element uses its level that its suffix, but this should not be exploited in the statement:

art of ASCI:

-- A1 (peter,paul)
--   \_ B2
--   \_ C2
--        \_D3 (thomas)
--            \_X4
-- E1
--   \_F2
-- G1
--   \_H2 (heidi)

examples of data

drop table foohierarchy;
drop table useritems;

create table foohierarchy (
child_item varchar2(30),
parent_item varchar2(30));


insert into foohierarchy values ('B2','A1');
insert into foohierarchy values ('C2','A1');
insert into foohierarchy values ('D3','C2');
insert into foohierarchy values ('X4','D3');
insert into foohierarchy values ('F2','E1');
insert into foohierarchy values ('H2','G1');

create table useritems (
username varchar2 (40),
item varchar2(30)
);

insert into useritems values ('peter','A1');
insert into useritems values ('paul','A1');
insert into useritems values ('thomas','D3');
insert into useritems values ('heidi','H2');

commit;

my attempt at fixing the hierarchy table

with fixedhierarchy as
(select parent_item,child_item from foohierarchy
union all
select distinct null parent_item,parent_item child_item from foohierarchy where parent_item not in (select child_item from foohierarchy))
select * from fixedhierarchy;

Which should return to select it:

'peter'|'A1'
'paul'|'A1'
'thomas'|'A1'
'thomas'|'C2'
'thomas'|'D3'
'heidi'|'G1'
'heidi'|'H2'

Hello

Thanks for posting the CREATE TABLE and INSERT statements; It's very useful! Don't forget to mention which version of Oracle you are using. This is especially important with the predetermined; all versions since Oracle 7 had significant improvements in how to handle them.

I'm kinda comfused about what you want. Are you trying to permanently change the tables? If so, show what the changed table should look like when the work is completed. After the release, you do not want to see of "SELECT * of useritems;" or "SELECT * FROM foohierarchy;", or, if you want to change the two tables, both.

Looks like you have two distinct problems:
(1) change foohierarchy, so that each item appears once as a child_id. That means add lines with NULL parent_item for all the roots ('A1', 'E1' and 'G1'). The query you posted seems oriented toward it.
(2) denormalization useritems, so that when a user name is bound to an element, the user name is linked to all this that the ancestors of the element, too. Results you posted seem to be what you want useritems to look after that.

Here's how to do these things:

(1) change of foohierarchy

The query you posted seems good. Do you see anything wrong with it? You can use this query (or something very close to it) in an INSERT or MERGE statement.
If you just want to add some new lines to foohierarchy, you need not Union: just the second part of it. If you are sure that none of these lines already exist in foohierarchy, then

INSERT INTO foohierarchy (parent_item,      child_item)
     SELECT DISTINCT   NULL,          childitem
     FROM     foohierarchy
     WHERE     parent_item     NOT IN (
                         SELECT      child_item
                         FROM     foohierarchy
                           )
;

If some of the roots may already exist in foohierarchy correctly, then you will like something in the WHERE clause to make sure that you n '; t add a duplicate. A MERGE statement can do better than the INSERT.

(2) useritems denormalization

This adds new lines at useritems, to make it look like what you have posted:

ERGE INTO     useritems     dst
USING (
     WITH     all_ancestors     AS
     (
          SELECT     CONNECT_BY_ROOT child_item     AS descendant
          ,     parent_item               AS ancestor
          FROM     foohierarchy
          START WITH     child_item   IN     (
                                   SELECT     item
                                   FROM     useritems
                              )
          CONNECT BY     child_item   = PRIOR parent_item
     )
     SELECT DISTINCT
          u.username
     ,     a.ancestor
     FROM     all_ancestors     a
     JOIN     useritems     u  ON     a.descendant     = u.item
      )                    src
ON     (     src.username     = dst.username
     AND     src.ancestor     = dst.item
     )
WHEN NOT MATCHED THEN
     INSERT     (dst.username,     dst.item)
     VALUES     (src.username,     src.ancestor)
;

After doing this, ' SELECT * from useritems; "will produce this output:

USERNAME   ITEM
---------- ----------
paul       A1
peter      A1
thomas     A1
thomas     C2
thomas     D3
heidi      G1
heidi      H2

Here's how it works:
All_ancestors of the subquery is a bottom-up CONNECT BY query, connecting each node in useritems with all his ancestors. CONNECT requests are often slow in the best of circumstances; do a join in a query CONNECT BY makes it even slower. It is more effective to CONNECT BY query first, in a subquery and then join tht game results at the other tables, like I did in src.

Tags: Database

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