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Differentiate between a unique key and a primary key.
- By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
- Primary key doesn't allow NULLs however unique key allows one NULL.
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
The issues relating to the Design of the Physical Database Files Physical File is a file as stored on the disk. The major issues relating to physical files are: • Cons
Deletion Anomalies: Loss of important Information: In some cases, useful information may be lost when a tuple is deleted. For instance, if we delete the tuple corresponding to stu
ddlc
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Describe the various types of Online Analytical Processing (OLAP) tools and briefly discuss how the support common analytical operations.
notes about update opreation
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