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Across 3. The primary key is selected from _______________ key. 6. A ___________ key is a set of one or more columns in any table which may hold the value(s) found in the primary key column(s) of some other table. 8. A ____________ operator produces a relation that include all tuples in both R1 and R2 where R1 and R2 must be union compatible. 9. 4. Within a table, the primary key must be unique so that it will uniquely identify each row. In this case, the table is said to exhibit _____________integrity. 10. ______________works on a single relation R and defines a relation that constrains only those tuples (row) of R that satisfy the specified condition (predicate).

Down 1. __________ is number of rows in a table. 2. The relational model uses some unfamiliar terminology. Choose the terminology that synonymous to attribute. 4. A ____________ is the set of allowable values for one or more attributes. 5. The ________________ operator returns all tuples in one relation that are not found in other relation. 7. The ______ set operator combines all tuples from two relations excuding duplicates.