UpgradeSchema.php

<?php

namespace PCAPredict\Tag\Setup;

use Magento\Framework\DB\Ddl\Table;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\SchemaSetupInterface;
use Magento\Framework\Setup\UpgradeSchemaInterface;

// Upgrade will only trigger if the setup_version in the module.xml is increased.
class UpgradeSchema implements UpgradeSchemaInterface
{
    public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();

        if (version_compare($context->getVersion(), '2.0.7', '<')) {
            // Get module table
            $tableName = $setup->getTable('pcapredict_tag_settingsdata');

            // Check if the table already exists
            if ($setup->getConnection()->isTableExists($tableName) === true) {
                // Remove any columns we don't need.
                $setup->getConnection()->dropColumn($tableName, 'update_time');

                // Add the version column so we can record what version of the app the creds were created from.
                // In UpgradeData we set this column to the current version.
                $setup->getConnection()->addColumn(
                    $tableName,
                    'module_version',
                    [
                        'type'     => Table::TYPE_TEXT,
                        'length'   => 16,
                        'nullable' => true,
                        'comment'  => 'Created With App Version',
                    ]
                );
            }
        }

        $setup->endSetup();
    }
}