How do I add assignee = empty to a filter

[Natalie Humphreys]

I have a filter query :

assignee in ("scott williams", "joe smith", "john smith", "linda williams", "matt johnson") AND project = SDU ORDER BY Rank ASC

How could I also add that I want to make sure I filter by unassigned storys/bugs?

[Peter DeWitt]

Similar to what Mikael post but this small edition will limit results to just the story and bug issuetypes.

(assignee in ("scott williams", "joe smith", "john smith", "linda williams", "matt johnson") OR assignee is EMPTY) AND project = SDU AND issuetype IN (Story, Bug)

[Mikael Sandberg]

This query should do it:

(assignee in ("scott williams", "joe smith", "john smith", "linda williams", "matt johnson") OR assignee is EMPTY) AND project = SDU ORDER BY Rank ASC