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Put a table which may occur in the Relational DB version of your Entity-Relationship Diagram. What is an example of a key-constraint in this instance?

Example: example_col_4 example_col_1 entry_1 example_col_2 entry_2 example_col_3 entry_3 entry_4 Key-constraint: for a given

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Student table

Student_id studentName contactNo department_id

1 Jonny 123 cs

1 papa 234 ec

NULL Sugar 858 it

key constraint: primary key must have unique values and cannot be null

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