How to use decode or case function in this?

Hi,
I want to implement this condition in a query without using any user defined functions
1.if (T_fees = 'ABC' then if (p_fees>0) then nvl(p_fees,0) else (p_fees + a_fees) else 0)
2. if(g_fees <> (if t_fees = 'ABC' then if (p_fees>0) then nvl(p_fees,0) else (p_fees)
else 0
Is it possible to use any nested 'CASE' statement ?
This is very urgent...
Regards,
Shilpa

Hi,
Is it possible to use any nested 'CASE' statement ?Yes it it possible.
"afiedt.buf" 7 lines, 89 characters
1 SELECT sysdate FROM DUAL
2 WHERE 1 = (CASE WHEN 1=1 AND 2=2 THEN
3             1
4       ELSE
5             2
6*     END)
SQL>/
SYSDATE
07-AUG-06
1 row selected.
"afiedt.buf" 11 lines, 139 characters
1 SELECT sysdate FROM DUAL
2 WHERE 1 = (CASE WHEN 1=1 AND 2=2 THEN
3             CASE WHEN 3=3 AND 4=4 THEN
4                     1
5             ELSE
6                     0
7             END
8       ELSE
9             0
10*     END)
SQL>/
SYSDATE
07-AUG-06
1 row selected.
You can implement your logic.
Regards

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Dear Sir / Madam,
Thanks for your understanding.
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report error:
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INSNAME INSID STATUS
AAA 1000 Scheduled
AAA 1000 Processing
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FROM test_table
GROUP BY insname
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