• MySQL Что-то мне как-то не здоровится:

    (SELECT SQL_CACHE `comments`.`added` AS `ts`,
    `users`.`name` AS `s_name`,
    `users`.id AS `s_uid`,
    `users`.`sex` AS `s_sex`,
    `users`.`avatar` AS `s_icon`,
    'add-article-comment' AS `action`,
    `comments`.`id` AS `a_id`,
    `comments`.`content` as `a_content`,
    CONCAT('/articles/',`articles`.`alink`,'/#', `comments`.`id`) AS `a_link`,
    '' AS `a_icon`,
    `articles`.`id` AS `t_id`,
    `articles`.`title` as `t_content`,
    CONCAT('/articles/',`articles`.`alink`,'/') AS `t_link`,
    `articles`.`thumbnail` AS `t_icon`
    FROM `comments`
    INNER JOIN `articles` ON (`comments`.`obj` = `articles`.`id`
    AND `comments`.`module` = 3)
    INNER JOIN `users` ON (`comments`.`uid` = `users`.`id`)
    WHERE `comments`.`moderated` = 1
    ORDER BY `comments`.`added` DESC
    LIMIT 20)
    UNION (
    SELECT SQL_CACHE questions.`date` AS `ts`,
    `users`.`name` AS `s_name`,
    `users`.id AS `s_uid`,
    `users`.`sex` AS `s_sex`,
    `users`.`avatar` AS `s_icon`,
    'add-question' AS `action`,
    `questions`.`id` AS `a_id`,
    `questions`.`head` as `a_content`,
    CONCAT('/qa/',questions.`link`,'/') AS `a_link`,
    '' AS `a_icon`,
    '' AS `t_id`,
    '' as `t_content`,
    '' AS `t_link`,
    '' AS `t_icon`
    FROM `questions`
    INNER JOIN `users` ON (`questions`.`uid` = users.`id`)
    WHERE `questions`.`show` = 1
    ORDER BY `questions`.`date` DESC
    LIMIT 10
    ) UNION (
    SELECT SQL_CACHE answers.`date` AS `ts`,
    `users`.`name` AS `s_name`,
    `users`.id AS `s_uid`,
    `users`.`sex` AS `s_sex`,
    `users`.`avatar` AS `s_icon`,
    'add-answer' AS `action`,
    `answers`.`id` AS `a_id`,
    answers.`answer` as `a_content`,
    concat('/qa/', questions.`link`, '/#', `answers`.`id`) AS `a_link`,
    '' AS `a_icon`,
    `questions`.`id` AS `t_id`,
    `questions`.`head` as `t_content`,
    CONCAT('/qa/',questions.`link`,'/') AS `t_link`,
    '' AS `t_icon`
    FROM answers
    INNER JOIN `questions` ON (answers.`question` = questions.`id`)
    INNER JOIN `users` ON (`answers`.`uid` = users.`id`)
    WHERE answers.`show` = 1
    ORDER BY answers.`date` DESC
    LIMIT 20
    )
    UNION (SELECT SQL_CACHE `articles`.`pdate` AS `ts`,
    `users`.`name` AS `s_name`,
    `users`.id AS `s_uid`,
    `users`.`sex` AS `s_sex`,
    `users`.`avatar` AS `s_icon`,
    'add-article' AS `action`,
    `articles`.`id` AS `a_id`,
    `articles`.`title` as `a_content`,
    concat('/articles/', `alink`, '/') AS `a_link`,
    `articles`.`thumbnail` AS `a_icon`,
    '' AS `t_id`,
    '' as `t_content`,
    '' AS `t_link`,
    '' AS `t_icon`
    FROM `articles`
    INNER JOIN `users` ON (`articles`.`uid` = users.`id`)
    WHERE articles.`pdate` <= now() AND
    articles.aactive = 1
    ORDER BY articles.`pdate` DESC
    LIMIT 5)
    UNION
    (SELECT SQL_CACHE `comments`.`added` AS `ts`,
    `users`.`name` AS `s_name`,
    `users`.id AS `s_uid`,
    `users`.`sex` AS `s_sex`,
    `users`.`avatar` AS `s_icon`,
    'add-news-comment' AS `action`,
    `comments`.`id` AS `a_id`,
    `comments`.`content` as `a_content`,
    CONCAT('/news/',`news_categories`.`link`,'/',REPLACE(`news_content`.`bdate`,'-','/'),'/#', `comments`.`id`) AS `a_link`,
    '' AS `a_icon`,
    `news_content`.`id` AS `t_id`,
    `news_content`.`title` as `t_content`,
    CONCAT('/news/',`news_categories`.`link`,'/',REPLACE(`news_content`.`bdate`,'-','/'),'/') AS `t_link`,
    `news_content`.`thumbnail` AS `t_icon`
    FROM `comments`
    INNER JOIN `news_content` ON (`comments`.`obj` = `news_content`.`id`
    AND `comments`.`module` = 2)
    INNER JOIN `news_categories` ON (`news_content`.`id_cat` = `news_categories`.`id_cat`)
    INNER JOIN `users` ON (`comments`.`uid` = `users`.`id`)
    WHERE `comments`.`moderated` = 1
    ORDER BY `comments`.`added` DESC
    LIMIT 15)
    ORDER BY ts DESC LIMIT 20

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