SQL/sqlite challenge  for all:

I have a table with many columns describing objects on a disk.

    filename, date, owner, size
    A            12    MO    100
    B            13   JAK    90
    C            10   MO    80
    A            13   LU      70

I have many different ways of ordering these objects. Usually using several 
sort parameters.

I need a running sum of size that works regardless of what order the objects 
are in.

Sort by date,owner
Name     Size    Sum
C            80       80
A          100      180
B           90       270
A          70      340


Sort by filename, owner
Name     Size     Sum
A           70        70
A          100      170
B           90       260
C          80        340

User Function/Aggregates welcome!
thanks
Eliedaat Adler


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