回答編集履歴
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追記
test
CHANGED
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@@ -49,3 +49,95 @@
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49
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横方向へIDを自動的に増やしていくのにはプロシージャというもので処理します
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今回は煩雑にナリそうなので、上記まで理解することをおすすめします
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# プロシージャまで
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docにfuga4を追記した上でリストを自動でつくります
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- 元データ
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```SQL
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create table user(uid int unique,uname varchar(30));
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insert into user values(1,'hoge1'),(2,'hoge2'),(3,'hoge3');
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create table doc(did int unique,dname varchar(30));
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insert into doc values(1,'fuga1'),(2,'fuga2'),(3,'fuga3'),(4,'fuga4');
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create table user_doc(uid int,did int,unique(uid,did));
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insert into user_doc values(1,1),(1,2),(1,3),(2,1),(2,3),(3,2),(3,3);
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```
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- プロシージャ作成（1回だけ実効する）
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```SQL
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drop procedure if exists myproc;
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delimiter //
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create procedure myproc()
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begin
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declare a int;
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declare b varchar(100);
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declare done int default 0;
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declare cur cursor for
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select did,dname from doc order by did;
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declare continue handler for sqlstate '02000' set done=1;
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set @sql='select t3.uname,t2.* from (select t1.uid ';
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open cur;
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repeat
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fetch cur into a,b;
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if not done then
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set @sql=concat (@sql,',case sum(t1.did=',a,') when 0 then "" when 1 then "○" end as ',b,' ');
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end if;
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until done end repeat;
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close cur;
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set @sql=concat (@sql,'from user_doc as t1 ');
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set @sql=concat (@sql,'group by uid ) as t2 ');
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set @sql=concat (@sql,'inner join user as t3 on t2.uid=t3.uid ');
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prepare stmt from @sql;
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execute stmt;
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end
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//
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delimiter ;
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```
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- 実行
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```SQL
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call myproc;
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```
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