sql server - SQL DISTINCT for 2 Columns WHERE 3rd column = value -


i'm trying select count of distinct columns col 1 & col 2 col 3 = "complete".

firstly don't know how make distinct apply col 1 & col 2 opposed distinct own columns. secondly how exclude col 3 distinct..

select count(*) count  (select distinct dp, rn ecount  et = 'complete') rows

any thoughts?

example

col1    col2    col3     dp01    rn01    complete    yes dp01    rn02    incomplete   dp02    rn03    complete     dp02    rn03    incomplete   dp01    rn04    complete    yes dp02    rn05    complete    yes dp03    rn06    incomplete

result = 3

i don't think need include column 3 (aka, col et) in select part, can use in where statement directly.

so in example:

select count(*) count    (select distinct dp, rn ecount     et = 'complete'   ) rows

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