回答編集履歴
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追記
test
CHANGED
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@@ -3,3 +3,81 @@
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集計したテーブルをサブクエリにして
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カレンダーテーブルにleft joinしてあげてください
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# 追記
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ちょっとわかりにくいかもしれないのでプロシージャの書き方を追記しておきます。
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- 元データ
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```SQL
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create table sales(date date,price int);
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insert into sales values
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('2017-05-01',12000),
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('2017-05-02',12000),
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('2017-05-02',8000),
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('2017-05-02',8000),
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('2017-05-05',15000),
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('2017-05-05',6000);
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```
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- プロシージャを作ります。
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```SQL
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drop procedure if exists temp_cal;
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delimiter //
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create procedure temp_cal(in min date ,in max date)
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begin
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create temporary table temp(date date);
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set @d=min;
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while @d<=max do
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insert into temp values(@d);
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set @d:=@d + interval 1 day;
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end while;
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end
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//
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delimiter ;
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```
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- プロシージャをcallしつつ、カレンダーに連結します
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```SQL
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call temp_cal('2017-05-01','2017-05-05');
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select t1.date,coalesce(sum_price,0) as sum_price from temp as t1
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left join (select date,sum(price) as sum_price from sales group by date) as t2
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on t1.date=t2.date
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order by date;
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```
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