Question: Consider the employee database of Figure 4.12. Give an SQL DDL definition of this database. Identify referential-integrity constraints that should hold, and include them in

Consider the employee database of Figure 4.12. Give an SQL DDL definition of this database. Identify referential-integrity constraints that should hold, and include them in the DDL definition.

Figure 4.12. salary) employee (ID, person_name, street, city) works (ID, company_name, company (company_name, city)

salary) employee (ID, person_name, street, city) works (ID, company_name, company (company_name, city) manages (ID, manager_id)

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