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What is a cascading update?
Referential integrity constraints needs that foreign key values in one table correspond to primary key values in another. If the value of the primary key is altered -- that is, updated -- the value of the foreign key must directly be changed to match it. Cascading updates will set this alter to be done automatically by the DBMS whenever essential.
Create centralized relational database using bottom up method. (a) Recognize a single un-normalized relation for the above scenario. (b) Recognize the primary key for
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
explain in details about one to one binary relationship
Briefly explain the state diagram by taking one example. State Diagram - An object can be given a sequence of input instructions. The state of the object can vary depending u
Question: Using the data model express the following queries in SQL. (a) Create the Table named "Cinema" and make the cinema_code to be the primary key of the relation and
Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer? A candidate key is one that can be used as primary ke
he SQL query that will return the order number, quantity ordered, price each and total cost of an order (quantity * price each) from the order details table. Label the calculated c
Describe the various types of Online Analytical Processing (OLAP) tools and briefly discuss how the support common analytical operations.
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
Databases and data warehouses both are databases and both contains number of rows and columns of tables containing data. Data warehouse is really different from databases because d
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