Across
- 3. A __________ is the smallest unit of information that can be read from or written to the disk
- 4. _____ storage is easy to access because it is closer to the processor.
- 6. An association among two or more entities.
- 8. The _______operation performs a set union of two “similarly structured” tables
- 10. Properties that describe the characteristics of entities are called
- 11. The most commonly used operation in relational algebra for projecting a set of tuple from a relation is____
Down
- 1. _____is used to denote the selection operation in relational algebra (Greek word)
- 2. The attribute AGE is calculated from DATE_OF_BIRTH. The attribute AGE is_______ attribute
- 4. The attribute name could be structured as an attribute consisting of first name, middle initial, and last name.This type of attribute is called_________ attribute
- 5. A minimal super key is ______ key
- 7. In an E-R diagram attributes are represented by___________ symbol.
- 9. A key attribute cannot have _____values