Aggregate Functions
Aggregate functions perform a calculation on a set of values and return a single value.
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COUNT(col)
COUNT(*)Return the number of rows. When col is specified, the count returned will be the number of rows. When * is specified, the count returned will be the total number of rows.
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AVG(col)Return the average value of a given column.
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SUM(col)Return the sum value of a given column.
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MAX(col)Return the max value of a given column.
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MIN(col)Return the min value of a given column.