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SQL For Everyone - Tutorial 24 - Aggregate Functions
SQL aggregate functions return a single value, calculated from values in a column.
FUNCTION DESCRIPTION
AVG() Returns the average value
COUNT() Returns the number of rows
FIRST() Returns the first value
LAST() Returns the last value
MAX() Returns the largest value
MIN() Returns the smallest value
ROUND() Rounds a numeric field to the number of decimals specified
SUM() Returns the sum
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