Question

我正在尝试进行查询，并通过字段对结果进行不区分大小写的分组。这是我尝试过的，但它不起作用。

分组后降低关键字不会产生任何影响。

"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";

我也试过了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";

有什么可以建议我进行不区分大小写的分组吗？

Answer 1

我解决了这个问题。较低的关键字适用于组。但我的错误是一些领域最后还有额外的空间。所以我通过使用trim关键字修复它。下面的代码可以正常工作

"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";

SQLite中不区分大小写的GROUP BY查询

1 个答案: