: Count : Aggregate Functions MySQL TUTORIALS
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Aggregate Functions
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Count
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279.1 .
Using COUNT(*) in a table JOIN
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279.2 .
Use and IF() and COUNT() to give us a total as COUNT() ignores NULL values
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279.3 .
Distinct count
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279.4 .
COUNT(column name)
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279.5 .
Return the total number of rows
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279.6 .
COUNT(DISTINCT expr,[expr...]) (Returns a count of the number of different non-NULL values.)
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279.7 .
Count(*)
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Count
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Using COUNT(*) in a table JOIN
