21. A data dictionary is a special file that contains:
22. NULL is
23. Hierarchical model is also called
24. The RDBMS terminology for a row is
25. In a relational model, relations are termed as
26. Architecture of the database can be viewed as
27. What is a relationship called when it is maintained between two entities?
28. Cross Product is a:
29. Which of the following operations need the participating relations to be unon compatible?
30. To delete a particular column in a relation the command used is:
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