Optimizing Performance


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with tagged as (
    select PostId,
           case when TagId = 5 then 1 else null end as Opt,
           case when TagId = 241 then 1 else null end as Perf
    from PostTags
), perfopt as (
    select PostId,
        Max(Opt) as Opt,
        Max(Perf) as Perf
    from tagged
    where Perf = 1 OR Opt = 1
    group by PostId

Select Count (Opt) as Opt,
       Count(Perf) as Perf,
       Count(case when Opt = 1 and Perf = 1 then 1 else null end) as Both
from perfopt

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