回答編集履歴
1
追記
answer
CHANGED
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@@ -18,4 +18,57 @@
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18
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,sum(val*(indicator='users')) as users
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from daily_kpi
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group by dt;
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21
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```
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# 追記
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indicatorを別途マスター管理し、表示順を確定すればprocedureを利用できます
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- 元テーブル
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```SQL
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create table daily_kpi(dt date,id int ,val int);
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insert into daily_kpi values
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('2017-01-01',1,1800),
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('2017-01-01',2,500),
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('2017-01-01',3,200),
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('2017-01-02',1,2000),
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('2017-01-02',2,700),
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('2017-01-02',3,250);
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35
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create table indicator(id int primary key,name varchar(20));
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insert into indicator values
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(1,'impressions'),
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(2,'sessions'),
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(3,'users');
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```
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- procedure作成
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```SQL
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drop procedure if exists yokogaki;
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delimiter //
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create procedure yokogaki()
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begin
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declare a int;
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declare b varchar(255);
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declare done int default 0;
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declare cur cursor for
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select id,name from indicator order by id;
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declare continue handler for sqlstate '02000' set done=1;
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set @sql='select dt';
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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,",sum(val*(id=",a,")) 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 daily_kpi group by dt order by id");
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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 yokogaki;
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```
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