回答編集履歴
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@@ -89,3 +89,101 @@
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MySQL でやっています。日付の条件 `month(利用日) = 6` は、もう少しマシな方法に読み替えてもらえればと思います。
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---
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無理やり縦横の表形式にするならこんなかんじでしょうか。
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```sql
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select
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GameName as "5月/6月",
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sum(case when GameName6 = 'Game1' then num else 0 end) as Game1,
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sum(case when GameName6 = 'Game2' then num else 0 end) as Game2,
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sum(case when GameName6 = 'Game3' then num else 0 end) as Game3
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from
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(
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select GameName from t group by GameName
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) a
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left join
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(
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select
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t5.GameName as GameName5, t6.GameName as GameName6, count(*) as num
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from
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(
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select UserID, GameName from t where month(利用日) = 5 group by UserID, GameName
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) t5
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inner join
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(
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select UserID, GameName from t where month(利用日) = 6 group by UserID, GameName
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) t6
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on
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t5.UserID = t6.UserID
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group by
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t5.GameName, t6.GameName
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) x
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on
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a.GameName = x.GameName5
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group by
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GameName5
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order by GameName
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```
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```
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+-----------+-------+-------+-------+
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| 5月/6月 | Game1 | Game2 | Game3 |
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+-----------+-------+-------+-------+
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| Game1 | 1 | 1 | 1 |
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| Game2 | 1 | 1 | 1 |
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| Game3 | 0 | 0 | 0 |
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+-----------+-------+-------+-------+
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```
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