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Relational Algebra is a set of basic operations used to influence the data in relational model. These operations allow the user to specify basic retrieval request. The result of retrieval is a new relation, produced from one or more relations. These operations can be divided in two categories:
• Basic Set Operations
1) UNION
2) SET DIFFERENCE
3) INTERSECTION
4) CARTESIAN PRODUCT
• Relational Operations
1) JOIN
2) PROJECT
3) SELECT
4) DIVISION
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
Create a Student database and Retrieve the names of all students majoring in ‘CS' Consider the following relational database: STUDENT (name, student#, class, major) COURSE (co
how to design tables
Related fields in a database are grouped in which form? Related data fields in a database are grouped to form a data record. (A record is a collection of related fields)
What is conceptual model ? A conceptual model is a independent of both hardware and software.
Make SQL statements for the following scenarios. Your response should contain SQL statement, output and any other assumptions you have made to arrive at the answer. For Colorado cu
Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
Law Associates is a large legal practice based in Sydney. You have been asked to design a data model for the practice based upon the following specification: The practice employs
In a relational model how relations are termed? In a relational model, relations are termed as tables. (The term ‘relation’ is the technical name of the ‘table’ in RDBMS)
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