回答編集履歴
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調整
test
CHANGED
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@@ -1,3 +1,89 @@
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ago_closeって前日の終値じゃないんですか？
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2
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前日のtoday_closeと当日のago_closeの値があっていません
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+
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# function
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任意の日付のn日前を拾うfunctionを作ってみました
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以下一度だけ実行してください
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```SQL
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drop function if exists prev_date;
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delimiter //
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create function prev_date(d datetime,i int) RETURNS datetime DETERMINISTIC
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begin
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set @a=null,@b=null;
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select (select count(*)+1 from (select distinct Date from table1) as t1 where t1.Date>t2.Date) into @a
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from (select distinct Date from table1) as t2
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where Date=d;
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select Date into @b
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from (select distinct Date from table1) as t3
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having (select count(*)+1 from (select distinct Date from table1) as t4 where t4.Date>t3.Date)=@a+i;
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return @b;
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end
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//
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delimiter ;
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```
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- テスト
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```SQL
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select SC,
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Date,
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prev_date(Date,1),
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prev_date(Date,2)
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from table1
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```
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- functionを利用して1日前、2日前のtodays_closeを拾う
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```SQL
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]select t1.SC,
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t1.Date,
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t1.todays_close,
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t2.Date,
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t2.todays_close,
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t3.Date,
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t3.todays_close
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from table1 as t1
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inner join table1 as t2 on prev_date(t1.Date,1)=t2.Date and t1.SC=t2.SC
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inner join table1 as t3 on prev_date(t1.Date,2)=t3.Date and t1.SC=t3.SC
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89
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```
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