回答編集履歴
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追記
test
CHANGED
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@@ -25,3 +25,73 @@
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```
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postgresでは違うのかな？
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#追記
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case を使えばどうとでもできます。全部書けばいいです。
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1.今日以降かどうか
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2.今日以降なら昇順（今日未満の日は適当に置き換え、今回はNULL）
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3.今日未満なら降順（今日以降の日は適当に置き換え、今回はNULL）
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```sql
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create table test(
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open_at date
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);
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insert into test(open_at)
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select X.open_at
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from (
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select cast('2018-03-16' as date) as open_at
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union all
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select cast('2018-03-15' as date) as open_at
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union all
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select cast('2018-03-14' as date) as open_at
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union all
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select cast('2018-03-13' as date) as open_at
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union all
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select cast('2018-03-12' as date) as open_at
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) as X
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select *
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,case when open_at>=CURRENT_DATE then 0 else 1 end as 今日以降かどうか
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,case when open_at>=CURRENT_DATE then open_at end as 今日以降日付
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,case when open_at>=CURRENT_DATE then null else open_at end as 今日未満日付
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from test
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order by 今日以降かどうか,今日以降日付,今日未満日付 desc
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```
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[http://sqlfiddle.com/#!17/2c989/3/0](http://sqlfiddle.com/#!17/2c989/3/0)
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