query: both sides of the equation cannot be zero: left = right

I have that table t defined below. In the column 'T.VAL', I have null values and string values. I have variable input ": i_val" which with I have a query "T.VAL" column as follows:
(1) if: i_val = null, then return folder where VAL is null (ID = 1)
(2) if: i_val = 'a', then return save where VAL = 'a' (ID = 2).

How to write this query, the best way?

Note that this query below is incorrect:
with T as
(select 1 ID, null VAL from dual
union all
select 2 ID, 'a' VAL from dual
union all
select 3 ID, 'empty' VAL from dual)
select * from T
where nvl(T.VAL, 'empty') = nvl(:i_val, 'empty');
If an entry is i_val = null, then it returns
1     null
3     empty
It's false, he must return only one record with ID = 1 in this case.

Published by: CharlesRoos on April 16, 2010 03:53 
SELECT *
  FROM T
 WHERE (t.val IS NULL AND :i_val IS NULL) OR(T.VAL = :i_val);

URS

Tags: Database

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