Let's say you have this data:
ID, FName, LName, DOB
1, John, Smith, 1/1/1990
2, Sally, Jones, 2/2/1981
3, Pete, Davis, 3/3/1992
4, Ron, Bush, 4/4/1983
As typed it the "middle" is between ID 2 & 3. But if you open it and its sorted by:
FName, the "middle" is between John (ID=1) & Pete (ID=3)...