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What is the use of unique function?
UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
can you please explain with the help of suitable example the difference between conflict equivalence and conflict serializability?
Define the concept of aggregation. Give two examples where this concept is useful. Ans: Aggregation transforms a relationship among the objects into a higher-level object. A
What is Hierarchical DBMS In HDBMS, data is structured in a tree like manner. There is a parent-child relationship between data items and the data model is very suitable for re
The clause in SQL which specifies that the query result should be sorted in ascending or descending order based upon the values of one or much more columns is Ans : Order by
Problem: (a) Briefly explain the ‘Hierarchical Database Model' using appropriate diagram. (b) List and briefly describe five potential benefits of the database approach comp
With the help of an example display how records can be deleted and updated in QBE. (i) Increase Pay_Rate of employees along with the skill of ‘cook' by 10%. (ii) Delete employee
Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
Explain the Aggregation implies concurrency Concurrency actually is: This in objects can be identified by the way they change state. Present objects can change state independen
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
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