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On answers which include SQL include your SQL and 5-10 lines of the output. 1. What is SQL? 2. What are primary, unique and foreign key constraints? What is referential integrity and how does it relate to these constraints? 3. Provide the DDL to make the PEOPLE_TEST table described below. Name Null? Type ——————————- ——– —- SSN NOT NULL VARCHAR2(9) LAST_NAME NOT NULL VARCHAR2(20) […]