UpgradeData.php

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<?php
namespace Magento\TestSetupDeclarationModule5\Setup;

use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\UpgradeDataInterface;

class UpgradeData implements UpgradeDataInterface
{
    public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $adapter = $setup->getConnection();
        $setup->startSetup();

        if (version_compare($context->getVersion(), '1.0.2') < 0) {
            $adapter->insertArray('reference_table', ['some_integer'], [6, 12, 7]);
        }

        if (version_compare($context->getVersion(), '1.0.3') < 0) {
            $adapter->delete('reference_table', 'some_integer = 7');
        }

        $setup->endSetup();
    }
}