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First Normal Form and second normal form
First Normal Form (1NF)
A relation is said to be in 1NF if it having no non-atomic values and each row can give a unique combination of values.
Second Normal Form (2NF)
A relation is said to be in 2NF f if it is already in 1NF and each attribute fully depends on the primary key of the relation. Speaking inversely, if a table has some attributes which is not dependant on the primary key of that table, and then it is not in 2NF.
Given the following set of functional dependencies {cf?bg, g?d, cdg?f, b?de, d?c} defined on R(b,c,d,e,f,g) a.Find a non-redundant cover. b.Find a canonical cover.
Describe file organisation? A file is organized logically as a sequence of records. These records are mapped onto disk blocks. A) Fixed-Length Records Type deposit=record
Describe the shadow paging technique.
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How to create a biological database based on viruses. How to decide which attribute should be there in the table and schema? How to identify the primary keys, foreign keys, domain,
Consider a bank that has a collection of sites, each running a database system. Suppose the only way the databases interact is by electronic transfer of money between one another,
what is lossless & dependency preserving decomposition ?
Consider employee (e_no, e_name, e_salary, d_code), dept (d_code, d_name) and dependent (depndt_name, e_no, relation). Show the names of employees in purchase and accounts departm
List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
What are the costs to be considered when a transaction has to be rolled back when recovering from deadlock? Ans: A few transaction will must rolled back (made a victim)
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