sql - How to Query Data for Certain Result -

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okay here data set

event_id |  workernumberid 3        |  worker1 3        |  worker2 3        |  worker2 3        |  worker3 5        |  worker4 5        |  worker5 3        |  null 5        |  null

i want query return below. though eventid 3 has 2 'worker2's still want count 1 non null item because same. 

event_id | workernumberidcount (a count of not null items)  3       |  3  5       |  2

thoughts?

try this

select event_id,count(distinct workernumberid) workernumberidcount  tablename  workernumberid not null group event_id

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