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TA貢獻1804條經驗 獲得超8個贊
ORDER BY article_rating, article_time DESC
僅當有兩篇具有相同評級的文章時才會按article_time排序。從我在你的例子中可以看到的一切,這正是發生的事情。
↓ primary sort secondary sort ↓
1. 50 | This article rocks | Feb 4, 2009 3.
2. 35 | This article is pretty good | Feb 1, 2009 2.
3. 5 | This Article isn't so hot | Jan 25, 2009 1.
但考慮一下:
↓ primary sort secondary sort ↓
1. 50 | This article rocks | Feb 2, 2009 3.
1. 50 | This article rocks, too | Feb 4, 2009 4.
2. 35 | This article is pretty good | Feb 1, 2009 2.
3. 5 | This Article isn't so hot | Jan 25, 2009 1.
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