回答編集履歴
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実行結果を追加
test
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@@ -33,3 +33,61 @@
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※`event_date`の型次第では、`DATEADD()`がエラーになるかなぁ。
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[追記]
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`event_date`の型が`int`とのことなので、クエリーの手直しが必要ですね。
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```sql
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CREATE TABLE event(ID varchar(1), event_date int);
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INSERT INTO event(ID, event_date) VALUES
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('A', 20150101)
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,('A', 20150203)
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,('A', 20150803)
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,('A', 20160201)
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,('B', 20130401)
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,('B', 20140501)
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,('B', 20150331);
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SELECT EV.ID, EV.event_date, COUNT(EV2.ID) AS freq_past_1year
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FROM event EV
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LEFT JOIN event EV2
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ON EV2.ID=EV.ID
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AND EV2.event_date < EV.event_date
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AND EV2.event_date > FORMAT(DATEADD(year, -1, DATEFROMPARTS(EV.event_date/10000, EV.event_date%10000/100, EV.event_date%100)), 'yyyyMMdd')
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GROUP BY EV.ID, EV.event_date
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ORDER BY EV.ID, EV.event_date;
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```
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以下、SQL Server 2012での実行結果です。
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