Term
| A _____ _____ is a collection of high-level data description constructs that hide many low-level storage details |
|
Definition
|
|
Term
| Most database management systems today are based on the _____ _____ _____ |
|
Definition
|
|
Term
| A _____ _____ _____ is a more abstract, high-level data model that makes it easier for a user to come up with a good initial description of the data in an enterprise |
|
Definition
|
|
Term
| A _____ is similar to a set in that it is an unordered collection of elements, but there could be several copies of each element, and the number of copies is significant-two multisets could have the same elements and yet be different because the number of copies is different for some elements |
|
Definition
|
|
Term
| We can think of * as shorthand for all the columns (in the cross-product of the _____-_____ in the FROM clause) |
|
Definition
|
|
Term
| In a _____ outer join, both Sailors and Reserves rows without a match appear in the result |
|
Definition
|
|
