Question

I’m trying to sort on a part of string as integer by CAST(pid AS SIGNED) with no success.

I think I need something like this pseudocode: CAST ON REGX('^islandora(/d?)$') OF pid AS SIGNED

doFields table has following structure:

+---------------+--------------+------+-----+---------+-------+
| Field         | Type         | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+-------+
| pid           | varchar(64)  | NO   | MUL | NULL    |       |
| ownerId       | varchar(255) | YES  |     | NULL    |       |
+---------------+--------------+------+-----+---------+-------+

here is sample data:

+----------------+---------+
| pid            | ownerId |
+----------------+---------+
| islandora:1050 | 8       |
| islandora:1052 | 8       |
| islandora:1053 | 8       |
| islandora:1054 | 8       |
| islandora:1055 | 8       |
+----------------+---------+

Answer 1

Try to use this ORDER BY –

ORDER BY SUBSTRING_INDEX(pid, ':', -1) * 1;