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Difference between two timestamp fields

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I have two fields DECISION_DATE and EVENT_DATE
Both are of type Timestamp in the database(DB2 v8)

i want to check if the diff between the two dates is 1.

I tried days(DECISION_DATE) - days(EVENT_DATE) = 1 .

I get the exception: days() is not a valid function.

What would be the best way?
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Hi JayaSiji,
Honestly I don't know the solution for this using Java methods,
I've faced this problem before, but as I'm using Oracle DB I used a query as the next:

This is how I solved my problem that day, hope it helps or gives a clue..
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