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Describe substring comparison in SQL. For the relation Person (name, address), write a SQL query that retrieves the names of people whose name starts along with ‘A' and address contains ‘Bangalore'?
SUBSTR is used to extract a set of characters from a string through specifying the character beginning position and end position and length of characters to be fetched.
example substr('hello',2,3) will return 'ell' Select name from Person where name like ‘A%' and address = ‘Bangalore'
What is recursion? Is it possible for a stored procedure to call itself or recursive stored procedure? How many levels of SP nesting is possible? Recursion is method of proble
examples of fields in a database
Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
Mention the various user privileges All privileges directly granted to the user or role. All privileges granted to roles that have been granted to the user or role.
Determine the Derived attribute to avoid re-computation Each class box consists of an ordered list of attributes and operations, each represented as a next string. We can find
Eliminate Columns Not Dependent On Key The Employee Relation satisfies - First normal form - As it has no repeating groups. Second normal form - As it do not have multi-a
Super keys of a relation can have extra attributes. Candidate keys are minimal super key, i.e. such a key have no extraneous attribute. An attribute is known as extraneous if even
Security: In a centralised system, access to the data can be simply controlled. Though, in a distributed DBMS not only does access to replicated data have to be controlled in many
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