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Explain the two types of participation constraint. Total: The participation of an entity set E in a relationship set R is said to be total if each entity in E participates i
to develop elrctronic database from manual forms
Two-way Associations Mostly, associations are travel in both directions, although not usually with same frequency. There are three approaches for the implementation. In
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
What is meant by normalization of data? It is a process of examining the given relation schemas based on their Functional Dependencies (FDs) and primary key to achieve the prop
Explain the use of constraints in functional model with suitable example. A constraint shows relationship between two objects at same time, or among various values of the sam
Dirty Reads: T10 reads a value which is updated by T9. This update has not been committed and T9 aborts. T9 T10 Value of x old value = 200
Which model is record based logical model? Network Modelis basically known as record based logical model.
A field-groups statement or an insert statement reverses storage space and transfers values. False.
HOW TO SOLVE THE LP Problems by simplex method?z=x1+-3x2+2x3
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