Query Tables Compare Results

[sdsocali]

Here is a new question. I have modified some front end Access stuff to only show a few options in the TASK table. I can get the query to just show non duplicate records but i want to be able to fine tune it more.

SELECT OAUSER_TASK.task_name, OAUSER_TASK.task_code
FROM OAUSER_TASK
GROUP BY OAUSER_TASK.task_name, OAUSER_TASK.task_code
HAVING (Count(*)=1)
ORDER BY OAUSER_TASK.task_name;

Here is what the table looks like
--------------------
proj_id | task_name
12 | A
13 | A
12 | G
12 | B
13 | B
13 | C
13 | D
---------------------
Instead of the above query returning
--------------------
proj_id | task_name
12 | G
13 | C
13 | D
--------------------
I want to be able to show only proj_id 13.
I can not figure out how to get that into the query.