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What is vertical fragmentation?
Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
it can be possible to create any table without primary key
What is an entity relationship model? The entity relationship model is a set of basic objects known as entities and relationship between those objects. An entity is a thing or
Which database level is closest to the users? External database level is closest to the users.
What is RDBMS terminology for a row? A tuple is a RDBMS terminology for a row
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
Software failures : In such cases, a software error abruptly stops the implementation of the current transaction (or all transactions), therefore leading to losing the state of pr
Define instance and schema? Instance: Collection of data kept in the data base at a particular moment is known as an Instance of the database. Schema: The o
What is equi join? Equi Join - It generates all the combinations of tuples from two relations which satisfy a join condition along with only equality comparison (=).
BCNF Boyce-Codd Normal Form A relation schema R is in BCNF if it is in 3NF and accepts an additional constraint that for every FD X A, X has to be a candidate key. If a relati
deffine class&object
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