Edgar
Good challenge for us!
here is a programatic solution for you

use ster excl
index on isblank(eclrhse) tag eclrhse &&this puts the trues between the falses and the 'blanks'
brow && take a look and see for yourself
go top
copy to false.dbf while eclrhse =.F. && copy off the falses leaving us at the first true
copy to true.dbf while eclrhse =.T. && copy off the true leaving us at the first blank
copy to blank.dbf while eclrhse =.F. && copy off the blanks


this will let you manipulate them separately
whew!
Alek

>Hello UT,
>
>select * from ster where SubStr(sunum,1,1) = "E" .AND. eclrhse == .F.
>
>returns cursor containing "unknown" or "unmarked" records as well.
>(logical not known yet)
>How may I return only records containing marked-logical-False?