回答編集履歴
3
訂正
test
CHANGED
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@@ -10,7 +10,7 @@
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|
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10
10
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11
11
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from a x
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12
12
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13
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-
where exists (
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13
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+
where not exists (
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14
14
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15
15
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select 1 from a
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16
16
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2
訂正
test
CHANGED
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@@ -16,8 +16,6 @@
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16
16
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17
17
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where b_id = x.b_id and created_at > x.created_at
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18
18
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19
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-
having count(*)=0
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20
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-
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21
19
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)
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22
20
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23
21
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```
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1
追記
test
CHANGED
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@@ -1 +1,23 @@
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1
1
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最後のSQLのcount()をSum()に変更してみて下さい。
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2
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+
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3
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+
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4
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+
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5
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+
結果だけでいいなら以下の記述で。（未検証です）
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6
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+
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7
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+
```SQL
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8
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+
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9
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+
select count(*)
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10
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+
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11
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+
from a x
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12
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+
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13
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+
where exists (
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14
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+
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15
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+
select 1 from a
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16
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+
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17
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+
where b_id = x.b_id and created_at > x.created_at
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18
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+
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19
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+
having count(*)=0
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20
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+
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21
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+
)
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22
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+
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23
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+
```
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