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Explain retrieval in QBE?
Retrieval in QBE : A "GUI" for expressing queries.
But has influenced many projects Especially PC Databases: Paradox, Access, etc.
Domain Constraints Domain constraints are primarily formed for defining the logically correct values for an attribute of a relation. The relation allows attributes of a relatio
Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
Objectives differentiate DDBMS and conventional DBMS; Describe Network topology for DDBMS; Describe the concepts of horizontal and vertical fragmentation; Descr
Durability : This property necessitates that once a transaction has committed, the changes made by it be never lost because of subsequent failure. Thus, a transaction is also a bas
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
please describe the data base management with the easy example &give the application?
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
The database will enable college administrators the ability to track students initial major. This will help college officials decide how best to prepare students for their goals an
HOW TO SOLVE THE LP Problems by simplex method?z=x1+-3x2+2x3
Explain Deadlock detection and recovery Deadlock Detection - A deadlock is said to take place when there is a circular chain of transaction, every waiting for the release of a
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