Databases Reference
In-Depth Information
C903
Episode C903-A
1
Episode C903-A
2
Episode C903-B
Episode C903-C
1
2
3
4
5
6
Jan
2010
Jan
2011
Jan
2012
Jan
2013
Jan
2014
C882
Episode C882-A
Episode C882-B
Episode C882-C
1
2
3
4
Jan
2010
Jan
2011
Jan
2012
Jan
2013
Jan
2014
P861
Episode P861-A
Episode P861-B
Episode P861-C
2
9
1
3
4
5
6
7
8
Jan
2010
Jan
2011
Jan
2012
Jan
2013
Jan
2014
Figure 11.4 Temporal Referential Integrity: After a Delete Cascade.
P861. C903 is no longer asserted to be a client of ours fromOctober
2010 to March 2011. And the policy owned by C903 is no longer
asserted to be in effect during that same period of time. Our delete
cascade is complete, and the new state of the database is now visi-
ble to its users. (We should therefore remove the angle brackets
from the row numbers in
Figure 11.3
. We have left them there to
make it easier to see the rows involved in the transaction.)
Glossary References
Glossary entries whose definitions form strong inter-
dependencies are grouped together in the following list. The
same glossary entries may be grouped together in different ways
at the end of different chapters, each grouping reflecting the
semantic perspective of each chapter. There will usually be sev-
eral other, and often many other, glossary entries that are not
included in the list, and we recommend that the Glossary be
consulted whenever an unfamiliar term is encountered.
