如何在Android 2.1中使用selects in join子句？

我有一个查询，它对加入组进行了神奇的排序，在Android 2.2（froyo）版本的SQLite上运行良好：

SELECT channels.*, p.*
FROM channels 
LEFT JOIN programs p ON channels._id = p.channel_id
JOIN (select p2.channel_id, max(p2.airdate) max_air FROM programs p2 
      GROUP BY p2.channel_id) pj
ON pj.channel_id = p.channel_id AND pj.max_air = p.airdate
ORDER BY channels.channel_index asc;

出于某种原因，加入不适用于Android2.1，但适用于

no such column: pj.channel_id

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我想这是因为SQLite已经从2.1升级到了2.2，但是什么样的SQL才是适合这两个版本的呢？

解决方案很简单，我只需要去掉别名“p”：

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解决方案很简单，我只需要去掉别名“p”：

SELECT channels.*, programs.*
FROM channels
LEFT JOIN programs ON channels._id = programs.channel_id
JOIN (select p2.channel_id channel_id, max(p2.airdate) max_air FROM programs p2
      GROUP BY p2.channel_id) pj
ON pj.channel_id = programs.channel_id AND pj.max_air = programs.airdate