I'm trying to delete orphan entries in a MySQL table.
I have 2 tables like this:
Table files:
| id | ....
------------
| 1 | ....
| 2 | ....
| 7 | ....
| 9 | ....
table blob:
| fileid | ....
------------
| 1 | ....
| 2 | ....
| 3 | ....
| 4 | ....
| 4 | ....
| 4 | ....
| 9 | ....
The fileid and id columns can be used to join the tables together.
I want to delete all rows in table blob where fileid cannot be found in the table files.id.
So using the example above that would delete rows: 3 & 4(s) in the blob table.