*first code:
*----------------------------------
select 0
use data1
? select() ** the result is 1
select 0
use data2
? select() ** the result is 2
*-------------- no problems in the first code. ----------------------
*second code :
*----------------------------------
use data1 in 0
? select() ** the esult is 1
use data2 in 0
? select() ** the esult is 1 ***** this result is 2 in the first code

*Why?
*Thanks.