Hi Richard!

Create a UDF that takes a float parameter and simply give back the
fractional part of a number. (Like Delphi's FRAC function). Declare a
domain like this:

CREATE DOMAIN quarter_ AS
DECIMAL(18,2)
NOT NULL
CHECK (INT_(VALUE*4)=0)

If you multiply the input value with 4 and see the frac part of the
product, it must be zero in the right cases. This works for me.

Regards:Alex