按隨機組分組的sqlite排序

Question

我有一張帶有曲目和專輯列的歌曲表，我希望以隨機專輯順序獲取它們。即，使得在每個專輯中歌曲將被分類，但專輯將以隨機順序。

例如，如果表是：

----------------- 
| track | album | 
----------------- 
| 1  | a  | 
| 2  | a  | 
| 3  | a  | 
| 1  | b  | 
| 2  | b  | 
| 1  | c  | 
| 2  | c  | 
----------------- 

比一個可能的輸出將是

----------------- 
| track | album | 
----------------- 
| 1  | b  | 
| 2  | b  | 
| 1  | c  | 
| 2  | c  | 
| 1  | a  | 
| 2  | a  | 
| 3  | a  | 
----------------- 

可以將其與一個單一的SQLite的查詢做什麼？

Answer 1

我不得不排序，以達到預期的訂單添加到MrSimpleMind的回答是：

WITH albums AS (SELECT DISTINCT album FROM songs ORDER BY RANDOM()) 
SELECT songs.* FROM albums 
LEFT JOIN songs 
ON songs.album = albums.album 
ORDER BY albums.rowid, songs.track 

Answer 2

首先，您需要隨機訂購專輯，然後選擇曲目。

with tt as (
    select distinct album from t order by random() 
) 
select t.track, tt.album 
from tt left join t on t.album = tt.album 
order by tt.rowid, t.track 
; 

見Sqlfiddle