編寫SQL查詢來顯示結果中特定的順序

Question

我有這個表

+----+--------+------------+-----------+ 
| Id | day_id | subject_id | period_Id | 
+----+--------+------------+-----------+ 
| 1 | 1  | 1   | 1   | 
| 2 | 1  | 2   | 2   | 
| 8 | 2  | 6   | 1   | 
| 9 | 2  | 7   | 2   | 
| 15 | 3  | 3   | 1   | 
| 16 | 3  | 4   | 2   | 
| 22 | 4  | 5   | 1   | 
| 23 | 4  | 5   | 2   | 
| 24 | 4  | 6   | 3   | 
| 29 | 5  | 8   | 1   | 
| 30 | 5  | 1   | 2   | 


to something like this 



| Id | day_id | subject_id | period_Id | 
| 1 | 1  | 1   | 1   | 
| 8 | 2  | 6   | 1   | 
| 15 | 3  | 3   | 1   | 
| 22 | 4  | 5   | 1   | 
| 29 | 5  | 8   | 1   | 
| 2 | 1  | 2   | 2   | 
| 2 | 1  | 2   | 2   | 
| 16 | 3  | 4   | 2   | 
| 23 | 4  | 5   | 2   | 
| 30 | 5  | 1   | 2   | 
+----+--------+------------+-----------+ 

所以，我要選擇的每一天，做這週數一個週期有不同的主題。所以第一個主題不會出現，直到所有主題都被選中。

Answer 1

可以ORDER BY period_id，然後再由day_id：

SELECT * 
FROM your_table 
ORDER BY period_Id, day_Id 

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