Question

I’ve searched forums for a solution, but the examples aren’t making sense to me. I know my syntax is incorrect, but it’s the idea I’m trying to get across.

Assuming query was ran at 2012-03-09 24:00:00. (I think I edited dummy values correctly)

task_status is a view, running = (began > ended), ran=((now()-ended) < 10h)

select * from task_status;
+----------------+---------------------+---------------------+---------+------+
| task           | began               | ended               | running | ran  |
+----------------+---------------------+---------------------+---------+------+
| MIRRORS_SPLIT  | 2012-03-09 19:15:48 | 2012-03-09 19:15:51 |       0 |    1 |
| NETWORK_BACKUP | 2012-03-09 19:25:01 | 2012-03-09 19:23:41 |       0 |    1 |
| TAPE_BACKUP    | 2012-03-09 19:26:01 | 2012-03-09 23:16:32 |       0 |    1 |
+----------------+---------------------+---------------------+---------+------+

I’m having issues creating a BACKUPS row, began=(MIN(NETWORK_BACKUP.began, TAPE_BACKUP.began), and end=(MAX(NETWORK_BACKUP.end, TAPE_BACKUP.end). Running and ran should evaluate correctly then, right?

I want to add a row that results as such:

| BACKUPS        | 2012-03-09 19:25:01 | 2012-03-09 23:16:32 |       0 |    1 |

Any help would be greatly appreciated.

Answer 1

Thank you, JustDanyul, that got me on the right track.

Here’s what I ended up using.

SELECT 0 =
  (
  SELECT 
  (
    (SELECT ran FROM expect.task_status WHERE task='NETWORK_BACKUP') 
    +
    (SELECT ran FROM expect.task_status WHERE task='TAPE_BACKUP')
  )
)