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Describe Participation Constraints?
Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another entity through the relationship type. This constraint specifies the minimum number of relationship examples in which each entity can participate in. It is sometimes known as the minimum cardinality constraint. There are two kinds of participation constraints - total and partial.
What sorts of tables one can se in designing the hierarchy of a LDB? Tables, which are having Foreign Key relations.
What are two special events? The two special events are as "entry" and "exit". Any action which is marked as linked to entry event is executed whenever given state is entered v
Define- relational algebra. The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relati
I need help in doing my dbms project
Types of Locks There are two necessary types of locks: Binary lock : This locking mechanism has two states for to a data item: locked or unlocked Multiple-mode loc
Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o
Due date for May 8
for the following business rules . Identify all entities, attributes, relationships, primary keys, cardinalities and constraints where appropriate 3. (9) An art museum owns a larg
Create centralized relational database using Top down method- Construction of Logical Model: Translation EERD into Relational Schema: Use the 8 steps algorithm of converting EERD
If R1 and R2 are two union compatible relations or functions, then the result of R3 = R1 ∩R2 is the relation that contains all tuples that are in both the relations In other words,
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