spikel - It's not simple as you think. How I can create query with determined value when in tbl i have "," but in sql should be ".". There are two different things for Ms Access. e.g. 0,3 <> 0.3
namliam - the code will be too complicated.
How would a count have such a number? average/sum or whatever else perhaps but count no way!
the comma in your "table" is only a display thingy, much like in a date column you can apply a format that shows "Friday 19 sept 2014 4:00:00 PM"...
The date in the table however ACTUALLY is a number (double even) 41901,6666666667
Or if you want it is actually #9/16/2014 16:00:00#, however neither case it is actually Friday 19 sept 2014 4:00:00 PM
Same goes for the decimal point the comma isnt really "in" the table it is a display thingy to help the user, actually IN the table it is still a dot.
This is (more or less) the same reason why lookups in tables are only major invites to major problems because you display something other than is actually there.... which will cause headaches when you apply filters or use SQL.