回答編集履歴
1
chousei
test
CHANGED
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@@ -7,3 +7,125 @@
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7
7
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回答した時点で日時を入れれば、answer_atが過去日で
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8
8
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9
9
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correctが0のモノが間違えた質問になります
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# 訂正
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15
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なんか効率悪そうなので考え方を換えます
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```SQL
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create table question(qid int primary key,qtext varchar(100)
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,a1 varchar(100)
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,a2 varchar(100)
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,a3 varchar(100)
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,a4 varchar(100)
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,correct_a int);
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insert into question values
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( 1,"q01_text","q01_a1","q01_a2","q01_a3","q01_a4",1),
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( 2,"q02_text","q0_a1","q02_a2","q02_a3","q02_a4",2),
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( 3,"q03_text","q03_a1","q03_a2","q03_a3","q03_a4",3),
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( 4,"q04_text","q04_a1","q04_a2","q4_a3","q4_a4",3),
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( 5,"q05_text","q05_a1","q05_a2","q5_a3","q5_a4",4),
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( 6,"q06_text","q06_a1","q06_a2","q6_a3","q6_a4",2),
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( 7,"q07_text","q07_a1","q07_a2","q7_a3","q7_a4",1),
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( 8,"q08_text","q08_a1","q08_a2","q8_a3","q8_a4",3),
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( 9,"q09_text","q09_a1","q09_a2","q9_a3","q9_a4",4),
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(10,"q10_text","q10_a1","q10_a2","q0_a3","q0_a4",4),
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(11,"q11_text","q11_a1","q11_a2","q1_a3","q1_a4",1);
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create table user(uid int primary key,uname varchar(20));
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insert into user values(1,'u1'),(2,'u2'),(3,'u3');
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create table user_question(uqid int primary key auto_increment,uid int not null,qid int not null,correct tinyint default 0,unique(uid,qid));
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insert into user_question(uid,qid,correct) values
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(1,1,1),
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(1,2,1),
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(1,3,1),
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(1,4,0),
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(1,5,0),
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(1,6,0),
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(2,1,1),
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(2,2,0),
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(2,3,1),
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(2,4,0),
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(2,5,1),
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(2,6,0);
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```
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96
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だとします。
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上記条件からuid=1の場合qid=1,2,3を除くもの、uid=2の場合qid=1,3,5を除くもの
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uid=3の場合すべてが対象になります。
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# 抽出
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```SQL
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select * from question as t1
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110
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where not exists(select 1 from user_question where qid=t1.qid and uid=1 and correct=1)
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```
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114
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115
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uid=xxのxxを指定すれば間違っていたものおよび未回答の物が表示されます。
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１問だけ表示したいならorder by とlimitを併用します
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```SQL
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122
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123
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select * from question as t1
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124
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125
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where not exists(select 1 from user_question where qid=t1.qid and uid=1 and correct=1)
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order by rand()
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limit 1
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```
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