How do I in the sql and pl/sql?

I have the following data in a table:

Cust_Id Relation_ID
1 2
1 3
2 3
1 v
5 7
6 7
7 8
8 9

for customer 1 is connected to client 2 somehow (could be the husband, for example) and is also linked to the customer 3. Client 2 is related to the customer, 3 3 client is then linked to the customer 4. Similarly, visitors 5,6,7,8 and 9 are all connected, but they are in no way related to customers 1,2,3 and 4.

I need to divide these data into related groups. So clients 1,2,3 and 4 in 1 (say Group 1), and customers 5,6,7,8 and 9 would be in another (say Group 2). Of course, this is a simple example, but my real data are more than that!
In theory, client 1 might also be in another 'group', say with the customers, 10, 11 and 12, that would not be associated with anyone in the Group 1. This would then form another group (say 3).

How I did it and communicate the results in sql/pl sql?

Hello

Tracey.Sheppard wrote:
My apologies - I'm one of these groups a little bit, which would have confused the issue further.

Groups must be:

Customer 195229 (father) Group: (father is 195229 no 195226!)
195229
195224
201147
195228
195226

Son, daughter, and mother of group
195224
195228
195229
195226

Group of friends of 11807
11807
201147

A group of friend of 201147
201147
195229
11807

For each customer, the group is their cust_id more people that they are directly related.

If a group consists of a node and all other nodes connected directly.
That is, x and are in the same group if (and only if) at least one of the following is true:
(1) cust_id = x and reln_id = y for a relationship line.
(2) reln_id = x and cust_id = y for a relationship line, or
(3) x = y
Is this fair?

If I do:

Select distinct (decode(cust_id,'195226',reln_id,cust_id))
in the relationship where (cust_id = ' 195226 'or reln_id = ' 195226')

I get:

DECODE (C
--------
195224
195228
195229

so 195226 group is foregoing plus 195226.

I don't think it's useful to think of "the 195226 group." Haven't you said that an id can be member of groups of two or more systematically? Aren't say you, below, that "195226 group' is equivalent to 'of 195224 group', and that the two are the same as"195228 group?

The same query, but with 295228 gives:

DECODE (C
--------
195224
195226
195229

so when 195228 is added, the group is the same. Here in a single group.

You are on the right track. Associate each node with all nodes connected directly to it, as well as to himself. It's that the subquery in the query below got_memebers. Note the similarity between got_members and the definition I gave to a group above.

WITH     got_members     AS
(
     SELECT     cust_id  AS id1,   reln_id  AS id2     FROM relation     UNION
     SELECT     reln_id  AS id1,   cust_id  AS id2     FROM relation     UNION
     SELECT     cust_id  AS id1,   cust_id  AS id2     FROM relation     UNION
     SELECT     reln_id  AS id1,   reln_id  AS id2     FROM relation
)
,     got_r_num     AS
(
     SELECT     id1
     ,     id2
     ,     ROW_NUMBER () OVER ( PARTITION BY  id1
                               ORDER BY          id2
                       )  AS r_num
     FROM     got_members
)
SELECT DISTINCT      SUBSTR ( SYS_CONNECT_BY_PATH (id2, ',')
                       , 2
               ) AS grp
FROM           got_r_num
WHERE           CONNECT_BY_ISLEAF     = 1
START WITH      r_num          = 1
CONNECT BY      r_num          = PRIOR r_num + 1
     AND      id1          = PRIOR id1
;

The main query uses String aggregation to obtain a unique identifier for each group. (The unique ID used above is the list separated by commas of the members in alphabetical order.) Got_r_num of the subquery is useful for making string using CONNECT BY aggregation. If you use another method of aggregation of the chain, you shouldn't have this subquery. (On my system, I would use the STRAGG function defined by the user, that is found in)
http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:2196162600402
.)

Please test (and correct, if necessary) any code before you post.
INSERT statements you posted all contain errors: the word "INSERT INTO * TABLE * relationship...» ». Reln_to and reln_of are each defined as VARCHAR2 (4), but almost all the values you are trying to use more than 4 characters.

With the data for this example:

CREATE TABLE relation (
cust_id varchar2(8),
reln_to varchar2(8),
reln_id varchar2(8),
reln_of varchar2(8) );

INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('195228', 'MOTHER',   '195226', 'SON');
INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('195229', 'FATHER',   '195226', 'SON');
INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('195229', 'FATHER',   '195224', 'DAUGHTER');
INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('195226', 'BROTHER',  '195224', 'SISTER');
INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('195228', 'WIFE',     '195229', 'HUSBAND');
INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('195228', 'DAUGHTER', '195224', 'MOTHER');
INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('11807',  'FRIEND',   '201147', 'FRIEND');
INSERT INTO relation(cust_id, reln_to, reln_id, reln_of) VALUES('201147', 'FRIEND',   '195229', 'FRIEND');

the above query gives these results:

GRP
-----------------------------------------------------
11807,195229,201147
195224,195226,195228,195229
11807,201147
195224,195226,195228,195229,201147

This assumes that the output will only contain related items. What happens if you have some entitiy which is not linked to another entity in your application? If you want to include "Islands" like this in your output, you must include them in the data somehow. The best way is probably to have a separate table that had a line per node, if not he was connected to all other nodes. Another way would be to have a line in the relationship that binds each otherwise node not connected to itself.

Tags: Database

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