有关Pentaho Report设计师的问题

Question

1. I have a datetime -type column in MySQL. Now, in my report I want to use only the date part for

   a. grouping

   b. comparison

I tried looking for a solution on the net, however I couldn't find it.

2. How to use distinct in the SQL query in report designer. If I design the following query

    SELECT COUNT (DISTINCT user_id) FROM mytable 

it converts the same to

SELECT DISTINCT COUNT (user_id) FROM mytable

Please help.

Answer 1

I never ran into such behavior, but, anyway, I think a quick (but not the best) workaround would be to use the following query:

select 
      count(0) 
from 
      (select distinct user_id from mytable) t

Answer 2

Doesn't work in version 3.9.1 It keeps changing it to give priority to DISTINCT I will give it a go to use the summarisation functions of Report Designer itself.

Cheers

AC