回答編集履歴
2
追記
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@@ -9,3 +9,35 @@
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```
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こんな感じでしょうか？
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### 追記 (2019/01/23)
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```SQL
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SELECT MIN(date) AS start_date,
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MAX(date) AS finish_date,
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休日区分,
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CASE
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WHEN DATE_FORMAT(date, '%M') <= 3
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THEN DATE_FORMAT(date, '%Y')+1 // 1~3月の場合に+1して年度の値にする
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ELSE DATE_FORMAT(date, '%Y')
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END AS year_period
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FROM calender
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GROUP BY 休日区分, year_period;
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```
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年度の処理、これでよいのでは？？
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(春休みが年度を跨いでいる場合は春休みが確実に終了している日(4/20とか)より前か後かで場合分けすればよいかと)
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書式の改善
test
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@@ -1,5 +1,11 @@
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```SQL
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1
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SELECT MIN(date) AS start_date, MAX(date) AS finish_date, 休日区分
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SELECT MIN(date) AS start_date, MAX(date) AS finish_date, 休日区分, DATE_FORMAT(date, '%Y') AS year
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FROM calender
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GROUP BY 休日区分;
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GROUP BY 休日区分, year;
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```
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こんな感じでしょうか？
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