Explanation:The union operator gives the result which is the union of two queries and difference is the one where query which is not a part of second query . 9. A ________ is a pictorial depiction of the schema of a database that shows the relations in the database, their attributes, and primary keys and foreign keys.
A. Schema diagram
B. Relational algebra
C. Database diagram
D. Schema flow
Answer:A
Explanation:The union operator gives the result which is the union of two queries and difference is the one where query which is not a part of second query . 9. A ________ is a pictorial depiction of the schema of a database that shows the relations in the database, their attributes, and primary keys and foreign keys.
A. Schema diagram B. Relational algebra C. Database diagram D. Schema flow
Explanation:None. 10. The _________ provides a set of operations that take one or more relations as input and return a relation as an output.