Load this data:
LOAD DUAL(t,n) INLINE [ t,n A,1 B,2 C,3];
Select "A", create a bookmark
Now load this data:
LOAD DUAL(t,n) INLINE [ t,n A,2 B,3 C,4];
Try to apply the bookmark "A"; it doesn't work, because bookmark "A" tracked qNum at the time the bookmark was created; 1 now the qNum col does not contain the value for '1'; even though "A" exists; no selection
Now load this data:
LOAD DUAL(t,n) INLINE [ t,n A,0 B,1 C,2];
Try to apply bookmark "A"; it selects "B" now the qNum col containing the value 2, is for "B"