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Explain outer join?
Outer Join - If there are any values in one table which do not have corresponding value(s) in the other, in an equi-join which will not be chosen. Such rows could be forcefully selected through using the outer join. The corresponding columns for in which row will have NULLs. There are actually three forms of the outer-join operation: left outer join ( X), right outer join (X ) and full outer join ( X ).
Describe Participation Constraints? Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another
What is the difference between SQL Server 2000 complete and differential backups? A complete backup makes a copy of the whole database. A differential backup creates a copy of
In Database software have only pure security or some dis secured by administrator?
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
what is meant semantic query optimization? how does it differ from other query optimization techniques?
how to implement hyrise in C plus plus
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
how does Btree differ from a B+ - tree?
Explain the two types of participation constraint. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
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