Aggregate Functions
Aggregate functions are used to compute against a "returned column of numeric data" from your SELECT statement. They basically summarize the results of a particular column of selected data.
Here are the Aggregate Functions
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MIN |
It returns the smallest value in a given column |
MIN(column | expression)
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MAX |
It returns the largest value in a given column |
MAX(column | expression)
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SUM |
It returns the sum of the numeric values in a given column |
SUM(ALL | DISTINCT column)
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AVG |
It returns the average value of a given column |
AVG( ALL | DISTINCT)
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COUNT |
It returns the total number of values in a given column |
COUNT ( [ALL | DISTINCT] column | expression | *)
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COUNT(*) |
It returns the number of rows in a table |
COUNT ( [ALL | DISTINCT] column | expression | *)
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