Comparison of nulls in where clause

Hi team,

I want to select the data in the table based on some condition.
The problem is the data that I have to look in where clause is null or has a certain value.

The data are unknown so I can not use "is null" because if the data is not null then I have to use the '=' operator.
Please suggest a way to handle this situation, example below make the situation clearer for you.


I want data retirve that matches the current value of variable value1, value2, value3.

Name of the table:-DEMO(A,B,C)

A, B AND C

1 2 null

3 5 null

6 7 8


Select A, B, C of demo where A = 1 and B = value2 and c = value3;

Value1, value2, value3 are the variables that have some that can also be null.
If value1 or value2 value 3 having null that the above query does not work because I have to use to compare null values is null.

Please suggest me the query from right or procedure to deal with the current scenario.

Hello

DECODE treats NULL as a value, so you can do something like

SELECT     a, b, c
FROM     demo
WHERE     DECODE (a, value1, 'OK')     = 'OK'
AND     DECODE (b, value2, 'OK')     = 'OK'
AND     DECODE (C, value3, 'OK')     = 'OK'
;

Tags: Database

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    Thank you that's what I ask but is it possible to verify the condition even using decode

    Yes, it is possible, but why?

    Just replace the query in this way:

    select *
  from fee_table f
where exists(select 1
                from bucket b
              where decode(:p_fee_flag, 'FEE', f.fee_date, f.fee_refund_date) between b.act_start_date and b.act_end_date)
  and decode(:p_fee_flag, 'FEE', null, f.fee_date) is null;

    Kind regards.

    Alberto

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