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Define NULL value
NULL value NULL means something is unknown. It does NOT mean null (the digit 0). Null is as well employed as attribute value for a particular entity in which attribute is not applicable for example name of child for unmarried.
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
What is magnetic disks?explain it? Magnetic disk provides the bulk of secondary storage of modern computer system. The disk capacity is growing at over 50% per year. But the st
What are the components of storage manager? The storage manager components include a) Authorization and integrity manager b) Transaction manager c) Buffer manager d
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
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
Create centralized relational database using bottom up method. (a) Recognize a single un-normalized relation for the above scenario. (b) Recognize the primary key for
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
Ask question #MinimRead Dennis et al. Chapter 6: Minicase 2. Work through it and answer the questions. See the attached example. SequenceDiagram.png Based on the structural mod
Write a short note on built in function in QBE? Built in function in QBE: QBE involves various built in functions like AVG, MAX,MIN,SUM and CNT. We must prefix these operator
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