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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.
Define identify relationship? Identifying relationship: An identifying relationship means in which the child table cannot be uniquely recognize without the parent. For exampl
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
10A.53 Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department. 10A.54 Code an Oracle Database trigger to allow the delet
explain in detail about time stamp orderting/
The database is to record information about artists for a (music) production company. An artist is the name of a singer or band; the name of the artist, the year the artist started
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
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