USING NULL AND SELECT ALL IN DECODE

COL1 has the following values:
COL1
====
A
B
C
A
B
C
A
D
D
SELECT COL1 FROM TABLE1 WHERE COL1 =
DECODE(:VAL1, 'A', 'AA', 'B', 'BB', 'C', 'CC', 'D', 'DD')
1. what about the null values ? how can I add to the above statements when I enter null for the parameter :VAL1
2. what about all the values in COL1, what shall I enter for :VAL1 ?
THANKS.

SELECT COL1 FROM TABLE1
WHERE nvl(COL1,0) = DECODE(:VAL1, 'A', 'AA', 'B', 'BB', 'C', 'CC', 'D', 'DD',null,0)
Can we use in this way?
Shishu Paul
Chandigarh-India

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USING NULL AND SELECT ALL IN DECODE

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