Created
December 6, 2017 22:24
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カラムにnullが含まれるなら結果がnullになるmax() ref: https://qiita.com/yuba/items/a402cc00f7e1ce900e4b
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| max(end_date) keep (dense_rank last order by end_date nulls last) |
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| case when count(case when end_date is null then 1 end) = 0 then max(end_date) end |
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