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max()
Returns the maximum value of a measure or date field.
Use max() on measure or date fields. Returns the maximum measure or the most recent date in the field.
Example - Find the Largest Opportunity for Each Account
1q = load "Ops";
2q = group q by 'Account_Name';
3q = foreach q generate 'Company' as 'Company', max('Amount') as 'Largest Deal';