Across
- 3. The_____ operation allows the combining of two relations by merging pairs of tuples, one from each relation, into a single tuple.
- 5. In E-R Diagram relationship type is represented by ___________ symbol.
- 7. Properties that describe the characteristics of entities are called
- 8. In the relational model, relationships between relations or tables are created by using ___________.
- 9. A relational database consists of a collection of
Down
- 1. The primary key is selected from __________ set.
- 2. A ________ in a table represents a relationship among a set of values.
- 4. For each attribute of a relation, there is a set of permitted values, called the ________ of that attribute.
- 6. In an E-R diagram attributes are represented by___________ symbol.
- 10. The ________ clause is used to list the attributes desired in the result of a query.