Mysql查询帮助

Question

我有这个问题：

(SELECT * FROM news WHERE Del='0' ORDER BY `Date` DESC)
    UNION
(SELECT * FROM news_collect WHERE Del='0' ORDER BY `Date` DESC)

现在在while循环中，如果记录来自table news或news_collect，我需要切换...怎么做？

由于

Answer 1

我会解决这个问题，添加一个自定义字段，保持列数不变。

(SELECT *, 'news' as source FROM news WHERE Del='0' ORDER BY `Date` DESC)
    UNION
(SELECT *, 'news_collect' as source FROM news_collect WHERE Del='0' ORDER BY `Date` DESC)

然后您可以使用switch($aRow['source'])。

Answer 2

尝试按如下方式修改查询：

(SELECT news.*, 'news' coming_from FROM news WHERE Del='0' ORDER BY `Date` DESC)
    UNION
(SELECT news_collect.*, 'new_collect' FROM news_collect WHERE Del='0' ORDER BY `Date` DESC)

（假设“coming_from”不是“新闻”表的一列）

然后使用“come_from”列来区分记录的来源。