In relation algebra, the symbol ∩ is
a. |
Union |
|
b. |
Set different |
|
c. |
Set intersection |
A recursive (role) relationship is a relationship between an entity and ________.
a. |
subtype entity |
|
b. |
itself |
|
c. |
an archetype entity |
And (⊥), or (v) and not ( ) are called
1. |
set of attributes |
|
2. |
set of comparison operators |
|
3. |
set of connectives |
|
4. |
set of constants |
Having the same number of attributes is called
1. |
unity |
|
2. |
identity |
|
3. |
compatibility |
|
4. |
same arity |
……….. ensures that the database remains in a correct state despite system failures and transaction failures
a. |
Transaction manager |
|
b. |
Transection |
|
c. |
Transection-managment component |
|
d. |
Concurrency-control manager |
Here are the answers to all questions
1: c. Set Intersection
2: b. itself
3: 2 (Set of Comparison Operators)
4: 3 - Compatibility
5: a- Transaction Manager
In relation algebra, the symbol ∩ is a. Union b. Set different c. Set intersection A...