/** * Add primary key to table by it name * * @param string $tableName * @param string $columnName * @return void */ protected function _addPrimaryKeyToTable($tableName, $columnName = 'entity_id') { $this->_connection->addIndex($tableName, 'entity_id', [$columnName], \Magento\Framework\DB\Adapter\AdapterInterface::INDEX_TYPE_PRIMARY); }