flow php

Documentation

Example: Min

Topic: Aggregations

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composer.json 
{
    "name": "flow-php/examples",
    "description": "Flow PHP - Examples",
    "license": "MIT",
    "type": "library",
    "require": {
        "flow-php/etl": "1.x-dev"
    }
}
code.php
<?php

declare(strict_types=1);

use function Flow\ETL\DSL\{data_frame, from_rows, int_entry, min, ref, row, rows, to_stream};

require __DIR__ . '/vendor/autoload.php';

data_frame()
    ->from(from_rows(rows(
        row(int_entry('a', 100)),
        row(int_entry('a', 100)),
        row(int_entry('a', 200)),
        row(int_entry('a', 400)),
        row(int_entry('a', 400))
    )))
    ->aggregate(min(ref('a')))
    ->write(to_stream(__DIR__ . '/output.txt', truncate: false))
    ->run();

Output

+-------+
| a_min |
+-------+
|   100 |
+-------+
1 rows

Examples

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