SQL & PL/SQL

Hi,

I need to use decode condition in where clause in such a way that if the respective column is null then consider the corresponding column

for eg

i have a query in place like below where p_fee_flag will be passed as either FEE or null i need to check another condition like if p_fee_flag is null then fee_date should be null when comparing fee_refund_date between TRUNC(BKT.ACT_START_DATE) AND TRUNC(BKT.ACT_END_DATE

SELECT 1

  FROM BUCKET BKT

  WHERE DECODE(P_FEE_FLAG,'FEE',TRUNC(FS.FEE_DATE),TRUNC(FS.FEE_REFUND_DATE))

  BETWEEN TRUNC(BKT.ACT_START_DATE) AND TRUNC(BKT.ACT_END_DATE)