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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
Normal 0 false false false EN-IN X-NONE X-NONE
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Find the names of all Albums that have more than 30 tracks. Result: (name: varchar(255))
explain ER Modeling?
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