Question

During a join I get the following Table (example):

+----------+----------+
| Hostname | Severity |
+----------+----------+
| host1    |   high   |
| host2    |  medium  |
| host1    |   high   |
| host2    |   low    |
| host1    |   low    |
| host2    |   low    |
| host1    |   low    |
| host2    |   high   |
| host1    |   high   |
| host2    |   high   |
+----------+----------+

Is it possible to create I JPQL query where I get the following result:

+----------+------+--------+-----+
| Hostname | high | medium | low |
+----------+------+--------+-----+
| host1    |  3   |   0    |  2  |
| host2    |  2   |   1    |  2  |
+----------+------+--------+-----+

I tried with COUNT and GROUP BY but I got something like that:

host1,high,3
host1,medium,0
host1,low,2

etc…

BR, Rene

Answer 1

A standard sql query would look like this – I’m not sure what effort is required to the API you are using, but its a pretty straight-forward group by with case logic.

select hostname, 
  sum(case when severity = 'high' then 1 else 0 end) as high,
  sum(case when severity = 'medium' then 1 else 0 end) as medium,
  sum(case when severity = 'low' then 1 else 0 end) as low
from
  Table
group by
  hostname
order by
  hostname