ErWin Data model is given from part of an HR system.

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.

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.

Make at least three Integrity Tests for all database.