27 lines
469 B
ObjectPascal
27 lines
469 B
ObjectPascal
uses MLABC;
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begin
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var text := '''
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id,created_at,name
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1,15.01.2023,Alice
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2,16.01.2024 12:30:00,Bob
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3,20.02.2023,Charlie
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4,05.03.2024 09:15:00,Diana
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''';
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var df := DataFrame.FromCsvText(text);
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var df2 := df.WithColumnInt(
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'year',
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cur -> cur.DateTime('created_at').Year
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);
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var grouped := df2.GroupBy('year').Count;
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Println('DataFrame с колонкой year:');
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df2.Print;
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Println;
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Println('GroupBy(year).Count:');
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grouped.Print;
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end.
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