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Define null values.
In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In these cases null value is used.
Client Server Databases- The concept behind the Client/Server systems is simultaneous, cooperative processing. It is an approach that presents a one systems view from a user's vie
Can we delete data element, which is being used by table fields. No we cant delete data element.
explain at least five widly used case tools
Describe the statement in SQL which allows to change the definition of a table? In SQL Alter statement is used to allow the changes the definition of a table.
List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
I have a small project that contains 3 deliverable s. I have done the first one and I would like you to help me with second one
Explain the function of input controls. Identify four types of input control and explain the function of each. Provide an example of a data integrity error that could occur i
in an organization several projects are undertaken. Each project can employ one or more employees. Each employee can work on one or more projects. Each project is undertaken on the
Define a relation ? Relation - A relations is a named two-dimensional table of data. Mathematically, a relation can be described as a subset of the cartesian product of a lis
I want to buy this but I want to see a couple sample questions first. http://www.expertsmind.com/library/what-happens-to-rms-error-for-the-training-data-set-51564843.aspx
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