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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 ).
Define the term Domain. For each n every attribute there is a set of permitted values known as the domain of that attribute.
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
What is difference among mysql_connect and mysql_pconnect? Mysql_connect() opens a new connection to the database while mysql_pconnect() opens persistent connection to the data
Un-Normalized Form (UNF) If a table having non-atomic values at every row, it is said to be in UNF. An atomic value is something that cannot be further decomposed. A non-atomic
Foreign Keys and NULL Let us take the relation: DEPT DEPT ID DNAME BUDGET D1 M
#queDefine a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pic
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
What does authentication refer? Authentication refers to the task of verifying the uniqueness of a person.
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Define NULL value NULL value NULL means something is unknown. It does NOT mean null (the digit 0). Null is as well employed as attribute value for a particular entity in which
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