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*SQL aggregate functions are calculated from values in a column, and return a single value.*
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General syntax for aggregate functions is: ::
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SELECT "function type" ("column_name")
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The following are examples of aggregate functions:
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* AVG() - Returns the average value
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* COUNT() - Returns the number of rows
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* FIRST() - Returns the first value
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* LAST() - Returns the last value
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* MAX() - Returns the largest value
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* MIN() - Returns the smallest value
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* SUM() - Returns the sum
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