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Fourth Normal Form (4NF)
When attributes in a relation have multi-valued dependency, further Normalization to 4NF and 5NF are needed. Let us first find out what multi-valued dependency is.
A multi-valued dependency is a typical type of dependency in which each and every attribute within a relation depends upon the other, yet none of them is a unique primary key.
Define Query Processing Query processing is the process of selecting the best plan or strategy to be employed in responding to a database request. The plan is then executed to
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
external and internal mapping with examples
An Enterprising group of Entrepreneurs introduced a new business named StoreItRite which is based on data storage and retrieval services. It provides the services and the company c
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
Synonyms It allows short names or alternative names for objects. Example : CREATE SYNONYM D30 FOR EMPD30; Now if we give command:
what are the topics in data management
Benefits and limitations
Column Constraints: NOT NULL, UNIQUE, CHECK, PRIMARY KEY, DEFAULT, REFERENCES, On delete Cascade : Using this key whenever a parent row is removed in a referenced
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