Gio Wiederhold PDM 5
1a. Data Integration
Needed when sources have inadequate coverage
•in
distinct DBs for
– Prices,
Number purchased
–Customer
segments (supermarket, stores, on-line)
implies some expectations
append attributes where keys match: Joe
include
semantic match Joe = 012 34
567
append rows where key types match: customer
include
semantic match customer = owner