回答編集履歴
2
回答修正
test
CHANGED
@@ -10,7 +10,11 @@
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10
10
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11
11
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select AVG(cnt) from (
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12
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-
select id, count(
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13
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select A.id, count(B.id) as cnt from transactions as A
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+
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INNER JOIN blocks AS B ON A.blockID = B.id
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16
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WHERE B.time BETWEEN '1262271600' AND '1293807599'
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)
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20
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1
回答修正
test
CHANGED
@@ -3,3 +3,19 @@
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3
3
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4
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5
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1つだろうが2つだろうが1つのSELECT文の中ではcountはレコード数を返すので同じ値になるので割り算しても`1`ですよ。
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7
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9
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```sql
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10
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11
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select AVG(cnt) from (
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12
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select id, count(blockID) as cnt from transactions group by id
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)
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```
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とかですかね。
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