How to correctly compose a query using the UNION operator?

Question

MySQL

There are two tables:
1) comment

id | task_id | date
1  |    1    |   1
2  |    1    |   2
3  |    2    |   2

2) deal

id | task_id | date
11 |    1    |   3
21 |    1    |   2

I need to write a query that would combine records by the "task_id" field and sort by the "date" field, and as a result I need to understand which record is from which table, i.e. I will need to rename the id or display some flag by which I could find out.
I wrote this query:

(SELECT C.id, date FROM comment AS C WHERE C.task_id = 1)
UNION
(SELECT D.id, date FROM deal AS D WHERE D.task_id = 1)
ORDER BY date

Which outputs:

id | date
1  |   1
22 |   1
2  |   2
11 |   3

But I can’t rename the columns so that it would be clear from which table the data is

Answer 1

(SELECT C.id, date,  'comment' as tname FROM comment AS C WHERE C.task_id = 1)
UNION
(SELECT D.id, date,  'deal' as tname FROM deal AS D WHERE D.task_id = 1)
ORDER BY date