回答編集履歴
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追記
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CHANGED
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@@ -9,3 +9,33 @@
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日付をつかったbetweenを取ると思った通りの期間が得られないこともあるので
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注意してください
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# 追記
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created_atをなぜ日付化しているか仕様がかいていないのでわかりません
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かりにcreated_atがdate型だとすると以下
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```SQL
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select created_at,count(*) as c,
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(select count(*) from users as t2 where created_at BETWEEN '2017-03-11' AND curdate()
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AND t1.created_at>=t2.created_at
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) as t
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from users as t1
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where created_at BETWEEN '2017-03-11' AND curdate()
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group by created_at
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```
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