Hi Schlogg,
Thanks your respond I try your sugest but it's not work... Here my real situation:
field1 is INSTITUTION: University or Work
field2 is RECCORD NUNBER: auto number start from 00001
field3 is TISSUE TYPE: Tumor, lymph node,..
field4 is NUMBER SAMPLING: 1, 2, 3, or 4
field5 is...