SQL Server :: Count Identical Data As One?

Mar 28, 2011

I have a db table MemberOccasion with two columns: memberID and occasionID where I keep members votes for occasions. A member can vote for several occasions. Every time a vote is inserted I need to check how many members have voted (and compare against the number of registered member in another table, but I do the comparison outside of this query). My question is this: Is it possible to do adjust the query below to accomplish this?

This is how I count all memberID in MemberOccasion:


with the result that the data in the table below would be counted as 8. Instead I need to count each memberID once. The result I want is that five members have voted.

memberID occasionID
1 28
1 30
2 30
3 29
4 30
5 28
5 29
5 30

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