Count « Aggregate Functions « MySQL Tutorial

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2.	Select Query
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5.	Table Join
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16.3.Count
	16.3.1.	COUNT()
	16.3.2.	COUNT(DISTINCT expr,[expr...]) (Returns a count of the number of different non-NULL values.)
	16.3.3.	Return the total number of rows
	16.3.4.	Count(*)
	16.3.5.	COUNT(column name)
	16.3.6.	Distinct count
	16.3.7.	Use and IF() and COUNT() to give us a total as COUNT() ignores NULL values
	16.3.8.	Using COUNT(*) in a table JOIN

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