SQLite中不区分大小写的GROUP BY查询

Question

我试图进行查询并使按字段区分大小写的结果分组。 这是我尝试过的方法，但是不起作用。

group by之后的较低关键字没有任何区别。

"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";

我也尝试过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";

您是否可以建议我进行不区分大小写的分组？

Answer 1

我解决了这个问题。 Lower关键字可以与group by一起使用。 但是我的错误是某些字段的末尾有额外的空间。 因此，我使用trim关键字修复了它。 下面的代码根据需要工作

"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";