Hi,

I have this query which works with Firebird 2.1:

SELECT * FROM TABLE WHERE TIMESTAMPFIELD > (CURRENT_TIMESTAMP - CAST(?
as DECIMAL(18,9))

However, if I try to execute this in older system with Firebird 1.5,
I get "Unknown data type" error. I tried different variations of CAST,
but couldn't find out the working combination since I don't quite
understand the problem. Any ideas how to fix this?