Hi,
Thanks for your solution it works well.
For the record, on a 1GB dbf it reduces the CDX by approx 4MB, but makes little or no difference with the performance.

>>Hi,
>>With binary indexes are you able to create a logical binary index based on the value of a numeric field i.e. IIF(osbalance=0,.F.,.T.) and have rushmore optimize it within a select.
>>i.e. Select * from invoice where osbalance=.T.
>>
>>It would save a lot of space in the index and should be faster as well.
>
>Yes, you can use a binary index in this case. However, you can simplify your index expression a lot.
>IIF(osbalance=0,.F.,.T.) can be simplified to osbalance#0, in other words

>Index on IIF(osbalance=0,.F.,.T.) tag yourtag && will work, but "overkill"
>Index on osbalance#0 tag yourtag && much shorter and faster

>The same simplifiation can be used in many cases which many programmers clearly are not aware of.

>lValue=.T.
>?lValue=.T. && Bad code
>?lValue && Good code

>Unfortunately youi can not set order to a binary index, but a binary index will be used to optimize queries.