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Saving Derived Attributes to Avoid Re-computation Data that is derived from other data should be stored in the computed form to avoid re-computation. For this, we could define
What is the way a particular application views the data from the database that the application uses? Sub schema is the way a particular application views the data from the data
Drawbacks of Data Distribution: The primary drawbacks of distributed database systems are the added complexity needed to ensure proper coordination between the sites. This increas
multidimensional data model
a project based on normalization with first, second and third normalization. There need to be a diagram also
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
ALTER TABLE Command : This command is used for variation of existing structure of the table in the given situation: When a new column is to be added to the table structure.
What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is
Can we delete data element, which is being used by table fields. No we cant delete data element.
What are the benefits of prepared statements and place holders? Parameter binding operations automatically handle escaping of characters Encourage Statement reuse
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