How to use substitution variable in sql

Hai All
I have two tables Rgpmain and Rgpitem the fields are
Rgpmain
unitid,periodid, docno, vendcode ,vendname, part_taken_by and .....
Rgpitem
unitid, periodid, docno, partno, partname .... And i need to give some values in runtime using sub variable
i need to to four values in sub function and i will give one value and i need the result of one variable
The qurey will like this
Select * from rgpmain m, rgpitem i where unitid=1 and periodid=14 and m.unitid=i. unitid and m.periodid= i.periodid and m.docno = i.docno and vendcode ='&p_vendcode'
Or
m.unitid=i. unitid and m.periodid= i.periodid and m.docno = i.docno and vendname like '&p_vendname%'
Or
m.unitid=i. unitid and m.periodid= i.periodid and m.docno = i.docno and partname like '&p_partname%'
or
m.unitid=i. unitid and m.periodid= i.periodid and m.docno = i.docno and partno ='&p_partno'
This is my query
And while i am executing there are four options showing to enter..
My need is i need enter only one field Ie vendcode and execute the vendcode like ABC01 then i need the only
the result that belong to vendcode ABC01 but my query giving all the rows
Pls tell me what is wrong with my query
Thanks In Advance
Srikkanth.M

Hai
Thanks Man i under stood that nv2 if 1 col is null then it will return 2 col or els 1 col but i working with large
database and i need four or five column using sub. Pls tell whats went wrong with my query when i am executing
one by one at the first time its works fine but next time it returns 1000 rows. pls tell me how to use four or five columns
Regards
srikkanth.M

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