Erwin Data model is given from part of an HR system. 1. Create SQL DDL Stataments for all the entities. Make sure you have proper use of primary keys and foreign keys. STUDENTNO_ in each entity should be replaced by your student no. Suppose your student No is 123456 then the table name STUDENTNO_EMPLOYEES should be 123456_EMPLOYEES. 2. Create DDL Statements regarding the tables. There Should be at least one row to be INSERTED for each table. There should be AT LEAST one UPDATE and one DELETE Statement throught the data model. 3. Make at least three Integrity Tests for all database.