回答編集履歴
1
追記
answer
CHANGED
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@@ -3,4 +3,5 @@
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3
3
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, sum(case when result=1 then 1 else 0 end ) / count(*)
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4
4
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from items
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5
5
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group by id
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6
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-
```
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6
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+
```
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7
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+
解説は不要ですよね？
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