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Explain the Natural join Natural join is a binary operator which is written as (R* S) in which R and S are relations. The effect of the natural join is the set of all combinati
Write short notes on tuple relational calculus. The tuple relational calculation is anon procedural query language. It defines the desired information without giving a particul
What are the two integrity rules? Ans: The two integrity rules are: Entity Integrity Rule & Referential Integrity Rule. Entity Integrity Rule - If the attribute A of rel
how to write tables and drow E-R diagrams for hosiptal management system and how to normalize and cardinalities?
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
cardnality ratio for humanresource mangement system
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
Project Description: We have purchased facebook style chat software which we are using with our site. It is prepared in PHP but the rest of the site is developed asp.net. Iss
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
explain multi key file organisation
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