Update Aggregate Functions.md

JoyeBright · May 1, 2019 · 1d5b5a4 · 1d5b5a4
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 Use the SUM function to get the total duration of all films.
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 Select sum(duration) from films
 
 Get the duration of the longest film.
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 Select max (duration) from films
 
 Get the average duration of all films.
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 Select avg(duration) from films
 
 Get the average amount grossed by all films.
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 Select avg(gross) from films