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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 are the limitations of dbms?
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
What is the initial step for object-oriented designing The initial step for object-oriented designing is object modeling. Before we go into deep about object modeling first of
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
In the architecture of a database system which external level used? In the architecture of a database system view external level used.
Normalization :It is a process of examine the given relation schemas based on their primary key and Functional Dependencies (FDs) to achieve the properties Minimizing redun
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
The aims of the project are: 1. To enable the students to undertake the detailed design of a specific plant or process 2. The design projects includes: process selection; und
Consider the 1ollowin8 relation: CAR SALE (Car_id, Option_type, Option_listprice, Sale_date, Option_discountedprice) This relation refers to options installed in cars (e.g., crui
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