回答編集履歴
2
追記
answer
CHANGED
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@@ -11,4 +11,16 @@
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11
11
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select 1 from posts inner join comments on posts.id=comments.post_id
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12
12
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where posts.user_id=users.id
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13
13
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)
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14
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+
```
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15
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+
追記
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16
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+
--
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17
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+
users の行を求めたいのだから、keyのレベルを合わせるのにはサブクエリーが必須になるんですよね。
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18
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+
一応別パターン
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19
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+
```SQL
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20
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+
select *
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21
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from users inner join (
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22
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select user_id from posts inner join comments on posts.id=comments.post_id
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23
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group by user_id
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24
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having count(*)=sum(case when comments.body='foo' then 1 else 0 end)
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25
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) cond on cond.user_id=users.id
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14
26
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```
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1
修正
answer
CHANGED
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@@ -5,7 +5,7 @@
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5
5
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from users
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6
6
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where not exists(
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7
7
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select 1 from posts inner join comments on posts.id=comments.post_id
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8
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-
where posts.user_id=users.id and comments.body
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8
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+
where posts.user_id=users.id and comments.body<>'foo'
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9
9
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)
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10
10
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and exists(
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11
11
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select 1 from posts inner join comments on posts.id=comments.post_id
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