SELECT
    `post`.`post_id`,
    `category`.`category_id` AS `category_id`,
    `category`.`name` AS `category`,
    `post`.`date`,
    `post`.`title`,
    `post`.`body`
  FROM `post`
  LEFT JOIN `category`
    ON  `post`.`category_id` = `category`.`category_id`
 ORDER BY `post`.`date` DESC;