Problem with the query parameter

Hi,
I have data some thing like 

SQL> select * from temp_tabr;

INSTITUTE  STUDNAME   GR     MARKS
---------- ---------- -- ---------
xxxx       abc        A        500
xxxx       pqq        A        550
xxxx       zzz        B        300
xxxx       sss        B        400
yxxx       abc        A        500
yxxx       pqq        A        550
yxxx       zzz        B        300
yxxx       sss        B        400



I want a query to retrive the data based on 3 parameters
Institue is mandatory
GR and MARKS are optional

user may pass any one of the Optional parameters GR or MARKS not both

example he may pass Intitute and get all 8 records
if he pass Institue and grade it should retrive only those matching
if he pass institute and marks it should retrive only those matching

only grade or marks will be passed or neighter of them will be passed.


                             



create table temp_tabr(institute varchar2(10),
                  studname  varchar2(10),
                  grade     varchar2(2),
                  marks      number);

insert into temp_tabr values
('xxxx',             'abc',           'A',       '500');
insert into temp_tabr values('xxxx',             'pqq',           'A',       550);

insert into temp_tabr values('xxxx'  ,          'zzz' ,          'B'  ,     300);
insert into temp_tabr values('xxxx'  ,          'sss' ,          'B'  ,    400);


insert into temp_tabr values
('yxxx',             'abc',           'A',       '500');
insert into temp_tabr values('yxxx',             'pqq',           'A',       550);

insert into temp_tabr values('yxxx'  ,          'zzz' ,          'B'  ,     300);
insert into temp_tabr values('yxxx'  ,          'sss' ,          'B'  ,    400);

Like this?

select * from temp_tabr
where
institute='&a'
and grade = nvl('&b',grade)
and marks = nvl(to_number('&c'),marks)

If you pass parameters using the variable, you do not have to use to_number, you can directly pass the name of the variable. I have provided for you to test it in sql * more.

HTH,
Prazy

Tags: Database

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