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What are the different approaches for database design?
There are two basic approaches for database design which are as follows:
Attribute driven: It compiles a list of attributes relevant to application, and normalizes the groups of attributes which preserve functional dependencies. Entity driven: It discovers entities which are meaningful to application, and describe them.
Benefits and Limitations od Data Models?
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
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
why data in an RDMS need to be normalised
What is equi join? Equi Join - It generates all the combinations of tuples from two relations which satisfy a join condition along with only equality comparison (=).
Difference between Operating System and Database Security Security within the operating system can be executed at various levels ranging from passwords for access to system, t
how draw er diagram
what is attribute is attribute inheritance in dbms?
Rearrange the Execution Order for Efficiency Rearranging execution order for efficiency means executing such job that requires less execution time. By rearranging the object
What are data models? Explain it detail? Entity relationship model Rectangles Ellipse Diamonds Lines Relational model Relational model use a collection
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