One-to-One Relationships in ER Diagram to Database Schema 5 The image below is the employee table after shifting the start_date to the employee table. In the above image, the employees who are managers are 1, 2, and 4. One-to-One Relationships in ER Diagram to Database Schema 4 To understand this, we will consider the image shown below. In our case, it is the department entity type. We can shift the attributes of a one-to-one relationship to the ‘full participating’ entity type. Where will the start_date attribute be shifted, whether to the employee table or the department table? One-to-One Relationships in ER Diagram to Database Schema 3 Shifting the attributes of a relationship typeįrom the ER-Diagram, we can see that the ‘manages’ relationship has a start_date attribute. The mgr_ssn in the department table is referencing the ssn of the employee table, as shown below. We convert that manages relationship to an attribute called mgr_ssn into the department table. We got the manages relationship from the department manager attribute of the department table. In the above ER-Diagram, we have only one One-to-One Relationship ‘manages.’ One-to-One Relationships in ER Diagram to Database Schema The complete ER-Diagram is as shown below. The below image is the database schema that we have converted so far. We have already discussed the conversion of the works_for relationship in the ER-Diagram to Database schema. In this class, we will convert One-to-One Relationships in ER Diagram to Database Schema. One-to-One Relationships in ER Diagram to Database Schema For Complete YouTube Video: Click Here
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