NTA-NET (UGC-NET) Computer Science & Applications (87) Relational Database Design and SQL-Query Processing and Optimisation Study Material (Page 2 of 3)

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Update Operations and Dealing with Constraint Violations

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Update Operations and Dealing with Constraint Violations

For each of the update operations (Insert, Delete, and Update) , we consider what kinds of constraint violations may result from applying it and how we might choose to react.

Insert - It provides a list of attribute values for a new tuple t that is to be inserted into a relation R. It can take numerous forms as follows,

Image Shows Relational Constraints

This is the general form of the different constraints which are present

Domain constraint violation - Here some attribute value is not of correct domain. It relates to the Pr…

… (613 more words, 17 figures) …

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Relational Algebra and Relational Calculus

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Relational Algebra and Relational Calculus

Relational algebra is a widely used procedural query language. It collects instances of relations as input and gives occurrences of relations as output. It uses various operation to perform this action. Relational algebra operations are performed recursively on a relation.

In relational algebra, input is a relation which is a table from which data has to be accessed and output is also a relation is a temporary ta…

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