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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 3nf
What are the storage types? The storage types are: a) Volatile storage b) Nonvolatile storage
Describe the candidate key functions ? Candidate Key and Alternate Key: In some instances, an entity will have more than one attribute which can serve as a primary key. Any key
Explain the Dynamic Hashing Techniques There are two methods in it: extendible hashing - stores an access structure in addition to the file, and therefore is somewhat identica
The State of NewYork certifies firefighters throughout state and keep track all of them, as well as of the state’s fire departments. Each fire department has unique department numb
For the question given below, you are required to submit design and implementation documentation as described over the page. Design, implement (in Java), test and document a set of
i am not clear with the climetic condition of the north indian plain. can u plz explain it for me
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Need for Multiple Access Paths In practice, most of the online information systems need the support of multi-key files. For example, consider a banking database application hav
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
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