programming-for-dummies

274
Using Database Files
Prospect table
Name:
Address:
Phone:
Customer table
Name:
Address:
Phone:
Products bought:
Sale amount:
Date of purchase:
Non-relational databases store
duplicate data in separate tables.
To update data, you must update
separate tables.
Prospect table
Name:
Address:
Phone:
Customer table
Products bought:
Sale amount:
Date of purchase:
Relational databases store
information in separate tables
and then link or “relate” data
together. This physically stores
only one copy of data.
Figure 8-7:
Relational
databases
eliminate
duplication
of data by
letting
tables share
information.
Customer table
Name:
Address:
Phone:
Products bought:
Sale amount:
Date of purchase:
“Relating” multiple tables creates
a single table that organizes
related data in one place.
Figure 8-8:
Database
toolkits take
care of the
technical
details of
manipulating
a database
file so you
can focus on
just making
your program
do
something
useful.
Main
program
Commands
Data
Database
toolkit
Commands
Data
Database