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What is aggregate function? Briefly describe it?
Aggregate functions are functions that take a collection of values as input and return a one value. SQL offers 5 built-in aggregate functions:
a) Average: avg
b) Minimum:min
c) Maximum: max
d) Total:sum
e) Count:count
Average: avg
Select avg (balance)
From account
Where branch-name='perryridge'
Count :count
Select branch-name,count(distinct customer-name)
From depositior,account
Where depositor.account-number=account.account-number
groupby branch-name
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Objectives differentiate DDBMS and conventional DBMS; Describe Network topology for DDBMS; Describe the concepts of horizontal and vertical fragmentation; Descr
How much would you charge to create a database encompassing an Online Bakery with all the elements below? I. Describe the application that you would like to design. This should
Which language has presently become the defacto standard for interfacing application programs along with relational database system? The language which has recently become the
What are the object-oriented approaches Software systems which are designed with structured design methodology never support some of desired quality attributes for example reus
Domain Constraint It shows that each attribute in a relation has to contain an atomic value only from the corresponding domains. The data types associated with commercial RDBMS
recovey techniques based on deferred update and immediate update
a method named WonGame that checks each letter in the word is matched by its label
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
discuss the array implementation of a stack.
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