回答編集履歴
1
chousei
answer
CHANGED
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@@ -7,18 +7,18 @@
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7
7
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(3,'c'),
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8
8
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(4,'d');
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9
9
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10
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-
create table articles_users(id int,user_id
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10
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+
create table articles_users(id int,user_id int,article_id int);
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11
11
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insert into articles_users values
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12
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+
(1,1,1),
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12
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-
(1,
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13
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+
(1,2,1),
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13
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-
(1,'b',1),
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14
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-
(1,
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14
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+
(1,3,2),
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15
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-
(1,
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15
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+
(1,4,2);
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16
16
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17
17
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select * from users as t1
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18
18
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where exists(
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19
19
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select 1
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20
20
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from articles_users
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21
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-
where t1.
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21
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+
where t1.id=user_id
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22
22
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group by user_id
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23
23
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having sum(article_id=1)=0
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24
24
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);
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