89 books
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“
The Golden Rule:
No update operation must ever assign to any database a value that causes its database predicate to evaluate to FALSE.
”
― An Introduction to Database Systems
― An Introduction to Database Systems
“
...note that relational systems require only that the database be perceived by the user as tables. Tables are the logical structure in a relational system, not the physical structure. At the physical level, in fact, the system is free to store the data any way it likes—using sequential files, indexing, hashing, pointer chains, compression, and so on—provided only that it can map that stored representation to tables at the logical level. Another way of saying the same thing is that tables represe
...more
”
― An Introduction to Database Systems
― An Introduction to Database Systems
