Aggregate Result Query- Sum, Minimum, Maximum, Average and Count

Below query is on Opportunity object and on Amount Field.

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Aggregateresult[] aggresult= [Select COUNT(amount)countt, SUM(amount)sum, MIN(amount)min, MAX(amount)max, AVG(amount)avg from Opportunity]; System.debug('opportunity Count amount******'+aggresult[0].get('countt')); System.debug('opportunity SUM amount******'+aggresult[0].get('sum')); System.debug('opportunity MIN amount******'+aggresult[0].get('min')); System.debug('opportunity MAX amount******'+aggresult[0].get('max')); System.debug('opportunity Average amount******'+aggresult[0].get('avg'));