SQLite中不區分大小寫的GROUP BY查詢

Question

我試圖進行查詢並使按字段區分大小寫的結果分組。 這是我嘗試過的方法，但是不起作用。

group by之后的較低關鍵字沒有任何區別。

"SELECT " + MediaStore.Audio.Media.ARTIST + ", count(LOWER(" + MediaStore.Audio.Media.ARTIST +
                    ")) FROM " + PlaylistDB.TABLE_ALL_TRACKS + " GROUP BY LOWER(" + MediaStore.Audio.Media.ARTIST
                    +") HAVING " + MediaStore.Audio.Media.ARTIST
                    + " LIKE ? ORDER BY "+ MediaStore.Audio.Media.ARTIST + " COLLATE NOCASE ASC";

我也嘗試過COLLATE NOCASE。 也行不通。

"SELECT " + MediaStore.Audio.Media.ARTIST + ", count(LOWER(" + MediaStore.Audio.Media.ARTIST +
                ")) FROM " + PlaylistDB.TABLE_ALL_TRACKS + " GROUP BY LOWER(" + MediaStore.Audio.Media.ARTIST
                +") HAVING " + MediaStore.Audio.Media.ARTIST
                + " LIKE ? ORDER BY "+ MediaStore.Audio.Media.ARTIST + " COLLATE NOCASE ASC";

您是否可以建議我進行不區分大小寫的分組？

Answer 1

我解決了這個問題。 Lower關鍵字可以與group by一起使用。 但是我的錯誤是某些字段的末尾有額外的空間。 因此，我使用trim關鍵字修復了它。 下面的代碼根據需要工作

"SELECT " + MediaStore.Audio.Media.ARTIST + ", count(LOWER(TRIM(" + MediaStore.Audio.Media.ARTIST +
                "))) FROM " + PlaylistDB.TABLE_ALL_TRACKS + " GROUP BY LOWER(TRIM(" + MediaStore.Audio.Media.ARTIST
                +")) HAVING " + MediaStore.Audio.Media.ARTIST
                + " LIKE ? ORDER BY "+ MediaStore.Audio.Media.ARTIST + " COLLATE NOCASE ASC";