Hi Michael,
thank you very much for your prompt answer.
What I want to achieve is, counting the number of distinct items,
grouped by user_name
Given
Item1:
item_id = 1
service_id = 'test'
item_class = 'dummy'
Item2:
item_id = 2
service_id = 'other'
item_class = 'dummy'
Invoice1:
id = 1
user_name = 'lorem'
item = Item1
Invoice2:
id = 2
user_name = 'lorem'
item = Item1
Invoice3:
id = 3
user_name = 'ipsum'
item = Item1
Invoice4:
id = 4
user_name = 'ipsum'
item = Item2
the expected result is:
user: lorem, distinct item count : 1
user: ipsum, distinct item count : 2
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