Kdjykuj

class UpgradeSchema implements  UpgradeSchemaInterface

{

public function upgrade(SchemaSetupInterface     $setup,ModuleContextInterface     $context){

$setup->startSetup();

            if (version_compare($context->getVersion(), '2.0.0', '<=')) {

            $installer = $setup;

            $installer->startSetup();



         $table = $installer->getConnection()

        ->newTable($installer->getTable('my_booster'))

        ->addColumn(

            'review_id',

            Table::TYPE_SMALLINT,

            null,

            ['identity' => true, 'nullable' => false, 'primary' => true],

            'Review ID'

        )

        ->addColumn('pros', Table::TYPE_TEXT, 255, ['nullable' => false], 'What I like about this product')

        ->addColumn('cons', Table::TYPE_TEXT, 255, ['nullable' => false], 'What I dislike about this product')

        ->addColumn('title', Table::TYPE_TEXT, 255, ['nullable' => false], 'Custom Title')

        ->addColumn('review_comments', Table::TYPE_TEXT, 255, ['nullable' => false], 'Custom  Comments')

        ->addColumn('send_to', Table::TYPE_TEXT, 255, ['nullable' => false], 'Send reply to Customer')

        ->addColumn('helpful', Table::TYPE_TEXT, 255, ['nullable' => false], 'Was this review helpful?')

        ->addColumn('product_quality', Table::TYPE_TEXT, 255, ['nullable' => false], 'Product Quality ')

        ->addColumn('Product Value', Table::TYPE_TEXT, 255, ['nullable' => false], 'Product Value')

        ->addColumn('product_price', Table::TYPE_TEXT, 255, ['nullable' => false], 'Product Price')

        ->addColumn('image', Table::TYPE_TEXT, 255, ['nullable' => false], 'Viemo');



        $installer->getConnection()->createTable($table);

        $installer->endSetup();

    }

}

}

I am using this script.

i have got the correct working answer.

<?php



namespace VendorModuleSetup;



use MagentoFrameworkSetupUpgradeSchemaInterface;

use MagentoFrameworkSetupSchemaSetupInterface;

use MagentoFrameworkSetupModuleContextInterface;

use MagentoFrameworkDBDdlTable;





class UpgradeSchema implements  UpgradeSchemaInterface

{

  public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $context)

{

    $setup->startSetup();



    if (version_compare($context->getVersion(), '2.0.2', '<')) {

      $setup->getConnection()->addColumn(

        $setup->getTable("enter table name here"),

        'enter new column name here',

        [

          "type" => Table::TYPE_TEXT,

          "nullable" => true,

          "comment" => "xample"

        ]

      );

      $setup->getConnection()->addColumn(

        $setup->getTable("enter table name here"),

        'enter new second column name here',

        [

          "type" => Table::TYPE_TEXT,

          "nullable" => true,

          "comment" => "Xample 2"

        ]

      );

      $setup->getConnection()->addColumn(

        $setup->getTable("enter table name here"),

        'enter new third column name here',

        [

          "type" => Table::TYPE_TEXT,

          "nullable" => true,

          "comment" => "Xample 3"

        ]

      );



    }

    $setup->endSetup();

}

}

also you need to change etc/module.xml file. where setup_version="2.0.1" schema_version="2.0.1" .

Try this

class UpgradeSchema implements UpgradeSchemaInterface

{



    public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $context)

    {

        $installer = $setup;

        $setup->startSetup();



        $version = $context->getVersion();

        $connection = $setup->getConnection();



        if (version_compare($version, '2.0.0') < 0) {

            $connection->addColumn(

                $setup->getTable('my_booster'),

                'author_id',

                [

                    'type' => MagentoFrameworkDBDdlTable::TYPE_INTEGER,

                    'nullable' => true,

                    'comment' => 'Author ID',



                ]

            );



        }

    }