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When every condition appears with equality condition (=) only. c)
Natural join (denoted by R*S)
When two join attributes have the similar name in both relations. (That attribute is
Known as Join attribute), only one of the two attributes is retained in the join relation. The join condition in such a case is = for the join attribute. The condition is not given in the natural join.
What is a database? Database - Basically in simple terms A database is a collection of inter related data and/or information stored so which it is available to several users
what is Lossless-join decomposition
Why older data models are being replaced by new data modelling 100 words accepted#
State the Object Design for Processing The object design phase comes after analysis and system design phase. The object design phase includes implementation details like as i
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
How to draw an ER diagram to a finance companz
Design a database for an airline.The database must keep track of customers and their reservations,flights and their status, seat assignment on individual flights and, the schedule
One-to-one relationship: For every 1:1 relationship type R in the ER diagram including two entities E1 and E2 we take one of entities (say E1) preferably with total participatio
The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th
HOW MANY TYPES OF VIEWS
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