55
P.A. Bernstein, S. Melnik: Meta Data Management, ICDE'04 Boston
Diff
Diff
m
_
m
A
○
m
A
_
m
A
¢
m
_
m
B
○
m
B
_
m
B
¢
m
A
¢
OrderID
Product
Rebate
m
B
¢
OrderID
Product
Discount
ShipDate
m
Ax
Rebate
Discount
ShipDate
m
Bx
l
Identify
additions
(Diff)
OrderID
Product
Brand
m