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what is data link layer
What is a candidate key? Minimal super keys are known as candidate keys.
wh
What is the use of rename operation? Rename operation is used to rename both relations and an attributes. It uses the as clause, taking the form: Old-name as new-name.
What are the ways in which the variable-length records arise in database systems? Storage of many record types in a file. Record types that permit variable lengths for one o
Produce a set of relations (equivalent to the Finkelstein entity list) in third normal form (3NF) from the following un-normalised relation. You must use the Finkelstein methodolog
Why Like predicate used for? LIKE predicate: The LIKE predicate searches for strings in which have a certain pattern.
how the string works as keyword?
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
Failures and Recovery In practice various things might occur to prevent a transaction from completing. Recovery methods are used to bring database, which does not satisfy consi
1. Use the Invoice table structure shown below to answer the following questions: a) Draw the dependency diagram and identify the primary key and all dependencies, including al
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