Question

How can i achieve Outerjoin type of results usong oracle Reports Datalink option

Asked by: jyothsna1803

Hi,

i am developing a  Oracle Report. i am using Datalink to maintain parent-child relationship between 2 queries. If no matching value found then i want to return 0 Records. how to achieve this.
Ex: I have 2 tables like Dept & EMP
DEPT has 2 rows HR and FINANCE
I have only one employee in HR and no employee in FINANCE.
I am using the below datalink properties:
SQL clause : WHERE
CONDITION ; =
PARENT GROUP: DEPT
PARENT Column : DEPTID
CHILD QUERY : EMP
CHILD Column : DEPTID.

In the report it is showing matching columns without any issues> i want non matching columns also with Zero employess like

HR      1
FINANCE 0
 I need OUTER JOIN kind of thing. How can i achieve this. Just i have written one example. I have very complex query to implement this and datalink is absolutely necessry for me. Any help please.

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Asked On
2009-02-25 at 13:46:29ID24177926
Tags

Oracle Reports

,

Oracle IAS server

,

oracle database

,

oracle 10g

Topics

Oracle IAS Application Server

,

Oracle Database

,

Oracle 10.x

Participating Experts
1
Points
500
Comments
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Answers

 

by: MilleniumairePosted on 2009-02-26 at 06:57:23ID: 23745277

You would be better off building the report to use a single query rather than two queries linked together.  The single query would then perform the required outer join to retrieve exactly the data you want to see.

In the data model you would create two groups from the single query i.e. a parent and a child.  The report layout will be exactly the same as if you had used two queries as it is based on two groups.

 

by: jyothsna1803Posted on 2009-02-26 at 12:39:12ID: 23749440

I can't because it is really very big query. i want to split this query into small queries for maintenance.
I have modified the queries to display the data always (atleast null values). But now i have one issues.
here is the actual situation.
My master query is returning 2 rows
ID Desc
1   HR
2   FINANCE

I have 2 child queries.
First Child query is returning the below values.
ID  RegEmpCount
1    50
2    20

First Child query is returning the below values.
ID  UnRegEmpCount
1    10
2    40


In my report I want to display like this

ID   DEPT   RegEmpCount   UnRegEmpCount  TargetMet?
1    HR       50                    40                      Yes (             RegEmpCount -  UnRegEmpCount  >0)

ID   DEPT   RegEmpCount   UnRegEmpCount  TargetMet?
2    FINANCE       20                    40                      NO (             RegEmpCount -  UnRegEmpCount  >0)

How to write TargetMet? formula? RegEmpCount is from one group and UnRegEmpCount is another group. is ther any way? Please suggest me.

 

by: MilleniumairePosted on 2009-02-27 at 02:14:14ID: 23754197

Assuming the ID column in the two child tables is unique, you could build your query like this:

select m.id,
          m.desc
          nvl(c1.regempcount,0) regempcount,
          nvl(c2.unregempcount,0 unregempcount,
          case when c1.regempcount > c2.unregempcount then 'Yes' else 'No' end tergetmet
from master m,
        child1 c1,
        child2 c2
where c1.id (+) = m.id
and     c2.id (+) = m.id


I appreciate what you say about your query being very big, however it is more important to write your query to perform well and usually having a single query to retrieve your data will perform better than splitting the query up.

Consider your original approach of having 3 queries; 1 master, 2 child.  If 10,000 rows are retrieved from the master query, each of the detail queries will be run 10,000 times each, that is 20,001 queries running to retrieve your data.  With a single query, only 1 query will run.  The effect of re-running lots of queries can have a large impact on performance.

One technique I sometimes use for large queries in reports is to build a view to retrieve the data and write the report to retrieve from the view.  This simplifies the query used by the report and there is no performance overhead of doing this.

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