SUM « Aggregate Functions « MySQL Tutorial

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16.10.SUM
	16.10.1.	Using SUM([DISTINCT] expr) function to sum the salary
	16.10.2.	A SUM() function can be added to CASE statement to give us the total
	16.10.3.	SUM with NULL value
	16.10.4.	SUM() function totals the values in a given column.
	16.10.5.	SUM function with column calculation
	16.10.6.	Get the average of a set of sums for a grouped table
	16.10.7.	The SUM() and AVG() aggregate functions do not work with temporal values.

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