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Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
Before we talk about the relational model in more detail, let us first define some very basic terms used in this model. Tuple Every row in a table shows a record and is cal
Can we delete data element, which is being used by table fields. No we cant delete data element.
Preliminary entities and attributes of human resourse management database management system
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
Demonstrate the Design of associations During object design phase we must design a strategy to implement associations. Association may be unidirectional or bi-directional. Wha
Atomicity : Either all functions are laid out or none are. Users could not have to think about the effect of incomplete operations. DBMS ensures this by undoing the functions
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Database Recovery And Security Introduction In this part we will introduce two main issues relating to database management systems. A computer system suffers from dissi
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