I have a database table tblobjects like this:
object_name, reference_id
a 1
a 2
a 3
a 4
b 2
b 3
b 1
b 4
c 2
c 4
c 5
c 6
d 2
d 4
d 5
d 6
I now would like to have a SQL query which gives me the number of
unique object and reference combinations, like this:
a
b
c
d shouldn't be displayed...
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