Lets say we have a table review and need to update a record there.I will add the date of a review.

    $created_at = $this->getRequest()->getParam('created_at');
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
    $resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
    $connection = $resource->getConnection();
    $tableName = $resource->getTableName('review');
    $sql= "Update  $tableName Set created_at = '$created_at' where review_id = $reviewId";

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