Relational Databases for Each Table, Identify the Essay

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Relational Databases

For each table, identify the primary key and the foreign key(s). If a table does not have a foreign key, write None in the space provided.

PRIMARY KEY

FOREIGN KEY

Truck

TRUCK_NUM

BASE_CODE, TYPE_CODE

Base

BASE_CODE

TYPE_CODE

Do the tables exhibit entity integrity? Answer yes or no, and then explain your answer.

ENTITY INTEGRITY

EXPLANATION

Truck

All rows under the primary key TRUCK_NUM are uniquely identified and there are no null entries

Base

All rows under the primary key BASE_CODE are uniquely identified and there are no null entries

All rows under the primary key TYPE_CODE are uniquely identified and there are no null entries

19. Do the tables exhibit referential integrity? Answer yes or no, and then explain your answer.

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Write NA (Not Applicable) if the table does not have a foreign key.

TABLE

REFERENTIAL INTEGRITY

EXPLANATION

Truck

Yes

All values under the foreign keys BASE_CODE and TYPE_CODE refer to a valid tuple in the BASE and TYPE tables, respectively. Null values are allowed

Base

NA

NA

Type….....

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