Join two tables using union

Hi Gurus,
I have three tables. I want to join all tables using union in SQL statement. The query is returning all the records from both tables but i only require unique rows based on a specific column value. Here is my table structure -
TableA -
LIC_ID          NUMBER(10)     NOT NULL
LIC_NUMBER     VARCHAR2(20)
COMMENCE_DATE     DATE
EXPIRY_DATE     DATE
TERM          VARCHAR2(20)LIC_ID is the primary key in this table -
Sample data from TableA
LIC_ID          LIC_NUMBER     COMMENCE_DATE          EXPIRY_DATE     TERM
2          TR4323          12/04/2008          11/03/2010     2 Years
34          TR5432          23/07/2009          22/07/2010     1 Year
45          TR5321          24/06/2009          23/06/2010     1 Year
65          TR6666          23/07/2010          22/07/2011     1 Year
32          TR2423          30/05/2010          29/05/2011     1 YearTableB -
MAR_ID          NUMBER(10)     NOT NULL
LIC_ID          NUMBER(10)     NOT NULL
ZONE_NAME     VARCHAR2(20)
DEPARTMENT     VARCHAR2(20)
ACTIVITIES     VARCHAR2(200)
COMMENTS     VARCHAR2(200)MAR_ID is the primary key in this table and LIC_ID is the foreign key on TableA
Sample data from TableB -
MAR_ID          LIC_ID          ZONE_NAME     DEPARTMENT     ACTIVITIES     COMMENTS
23          2          ZONE A          IT          NONE               
43          34          ZONE B          IT          NONE
33          65          ZONE C          ACCOUNT          NONE     
          TableC
REC_ID          NUMBER(10)     NOT NULL
LIC_ID          NUMBER(10)     NOT NULL
DIST_NAME     VARCHAR2(20)
REGION          VARCHAR2(20)
ACTIVITIES     VARCHAR2(200)
COMMENTS     VARCHAR2(200)REC_ID is the primary key in this table and LIC_ID is the foreign key.
Sample data -
REC_ID          LIC_ID          DIST_NAME     REGION          ACTIVITIES     COMMENTS
2          45          SA          NORTH          NONE
3          65          TA          NORTH          NONE
5          32          NT          SOUTH          NONEHere is my sql query -
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableB b
where a.lic_id=b.lic_id
union
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableC c
where a.lic_id=c.lic_idThe above query returns -
lic_id          lic_number     commence_date          expiry_date          
2          TR4323          12/04/2008          11/03/2010     
34          TR5432          23/07/2009          22/07/2010     
45          TR5321          24/06/2009          23/06/2010     
65          TR6666          23/07/2010          22/07/2011     
32          TR2423          30/05/2010          29/05/2011
65          TR6666          23/07/2010          22/07/2011     LIC_ID 65 exists in both table TableB and TableC hence it repeats in query but I want to display that only once. How can I do that? I want to return unique record on LIC_NUMBER.
Hope this make sence.
Many thanks,
Tajuddin

Thanks for all your reply and suggestions. David altering session did not work.
Sven your idea helped me to figure it out what to do. I found a way around to fix it. Here is my current code -
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableB b
where a.lic_id=b.lic_id
union
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableC c
where a.lic_id=c.lic_id and c.lic_id not in ( select lic_id from TableB)This will exclude any LIC_ID exists in TableB.
Thanks again for your help guys.
Regards,
M Tajuddin
Web: http://tajuddin.whitepagesbd.com
Blog: http://aspblog.whitepagesbd.com

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