Across
- 3. The most commonly used operation in relational algebra for projecting a set of tuple from a relation is____
- 6. In an E-R diagram attributes are represented by___________ symbol.
- 8. _____is used to denote the selection operation in relational algebra (Greek word)
- 9. _____ storage is easy to access because it is closer to the processor.
- 11. ________is a join condition contains an equality operator
- 12. Properties that describe the characteristics of entities are called
Down
- 1. A key attribute cannot have _____values
- 2. An association among two or more entities.
- 4. A minimal super key is ______ key
- 5. The _______operation performs a set union of two “similarly structured” tables
- 7. A __________ is the smallest unit of information that can be read from or written to the disk
- 10. Every attribute is defined by its set of values called _____