回答編集履歴
2
誤字
answer
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@@ -1,4 +1,4 @@
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postgres で試してますが、 shiketa さんの定義コードを拝借して(`register text`→`registed date`)
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```sql
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create table hoge (
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id int,
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register→registed
answer
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@@ -1,10 +1,10 @@
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postgress ですが、 shiketa さんの定義コードを拝借して(`register`
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postgress ですが、 shiketa さんの定義コードを拝借して(`register text`→`registed date`)
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```sql
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create table hoge (
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id int,
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group_id int,
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value_number int,
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registed date
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);
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insert into hoge values
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@@ -21,16 +21,16 @@
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FROM hoge AS c
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JOIN (SELECT MAX(a.id) AS id
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FROM hoge AS a
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JOIN (SELECT group_id, MAX(
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JOIN (SELECT group_id, MAX(registed) AS registed
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FROM hoge
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WHERE
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WHERE registed <= '2025-08-01'
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GROUP BY group_id) AS b
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ON a.group_id=b.group_id AND a.
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ON a.group_id=b.group_id AND a.registed=b.registed
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GROUP BY a.group_id, a.
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GROUP BY a.group_id, a.registed) AS d
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ON c.id=d.id
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```
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```
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id | group_id | value_number |
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id | group_id | value_number | registed
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----+----------+--------------+------------
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2 | 2 | 21 | 2025-08-01
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5 | 1 | 14 | 2025-08-01
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@@ -38,7 +38,7 @@
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```
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7行目を `'2025-10-01'` に変えると
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```
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id | group_id | value_number |
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id | group_id | value_number | registed
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----+----------+--------------+------------
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3 | 1 | 12 | 2025-10-01
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6 | 2 | 22 | 2025-09-01
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