Question

Oracle adhoc SQL query to fetch Genealogy chain

Asked by: Phanumath

I am writing adhoc SQL query in Oracle which shouldn't use any PL/SQL code or commands. The beloow is my Business requirement.

I have a Genealogy data in my database. Genealogy is nothing but a product can be used in another batch to make a new product which can be used again.

Example: Item1 used to make Item2. Item2 used to make Item3 and so on.

If i give Item1 i need all the details of gnealogy. In this case It is Item1,Item2 and Item 3. However my database is too complex and require more joins to get Item1 details itself.

A correlated subquery is worthy to fetch one level but not more than one level.

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Asked On
2009-01-15 at 15:51:22ID24056616
Tags

Genealogy

,

Oracle

,

Correlated Sub query

,

Oracle SCM

Topics

Enterprise Software

,

Oracle 10.x

Participating Experts
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Points
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Comments
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Answers

 

by: sujith80Posted on 2009-01-15 at 17:45:08ID: 23389773

You can use the hierarchical queries in Oracle. Which allows your to traverse the dependency chain.

See the example below. WHere it traverse through the chain of managers of an employee until the ultimate row.

SQL> select empno, ename, mgr
  2  from emp;
 
     EMPNO ENAME                       MGR
---------- -------------------- ----------
      7369 SMITH                      7902
      7499 ALLEN                      7698
      7521 WARD                       7698
      7566 JONES                      7839
      7654 MARTIN                     7698
      7698 BLAKE                      7839
      7782 CLARK                      7839
      7839 KING
      7844 TURNER                     7698
      7900 JAMES                      7698
      7902 FORD                       7566
      7934 MILLER                     7782
      7788 SCOTT                      7566
      7876 ADAMS                      7788
 
14 rows selected.
 
SQL> select empno, ename, mgr, level
  2  from emp
  3  start with empno = 7788
  4  connect by prior mgr = empno;
 
     EMPNO ENAME                       MGR      LEVEL
---------- -------------------- ---------- ----------
      7788 SCOTT                      7566          1
      7566 JONES                      7839          2
      7839 KING                                     3

                                              
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by: PhanumathPosted on 2009-01-17 at 17:05:33ID: 23403227

Your answer is exreemely helpfull and i came to know i had not given enough information to resolve my problem.

select empno, ename, mgr, level
  2  from emp
  3  start with empno = 7788
  4  connect by prior mgr = empno;

The above will work if it is one table and will work under one context (includes joins)
Now situation is,

In my scenario EMP table is Master table but prior mgr ID exist in Table B and Table C
I want a hierarcal query if it found in table b or Table c system should continue otherwise it should halt. One intresting point is I have to make nearly four or five joines to conclude data exist in Table B similary to conclude on Table C.

Table B and Table C data are two different contexts with single transaction table.

 

by: sujith80Posted on 2009-01-17 at 20:31:00ID: 23403760

Can you give some sample data. Its difficult to visualize it and write a solution.

You can give sample data in some simple table structures. Table A, B and C...

As long as you have a query to join all the tables and the results of that query has all the hierarchical data, you can write the hierachical query.

20120131-EE-VQP-002

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