Oracle - Count distinct value without duplication from 2 tables

Hi,

I would like to count the number of time an equipment type was used on loads from 2 different tables, without any duplication that could be in both.

Each table as a load id and an equipment type attach to it. We cannot have the same load ID with 2 different equipment type.

Ex:

In load table, i may have below loads as an example:
Load table
In FP_MASTER_HIST, i may have below loads as an example:
FP_MASTER_HIST
As you can see. LOAD2 is duplicated and should only count as One.
What we also see is that we have same load id's in both table: load2 and load4. This also should be count only Once.

So the final result i would like to have in this Query would look like this:
Query result
I'm also giving a sample of the tables including the final result.

How can i do that?

Thank you for your help.
LOAD_COUNT_no2.xlsx
LVL 11
Wilder1626Asked:
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awking00Information Technology SpecialistCommented:
select equipment_type_id, count(*) as countwithoutduplication from
(select id, equipment_type_id from load
 union
 select id, equipment_type_id from fp_master_hist)
group by equipment_type_id
order by equipment_type_id;

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Wilder1626Author Commented:
Thank you. This is exactly what i needed.
awking00Information Technology SpecialistCommented:
Glad to help :-)
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