DATEDIFF中的SELECT无法正常工作

Question

SELECT DATEDIFF(day,(SELECT creation_date
   FROM time_info
   WHERE is_on = 'yes'
   LIMIT 0,1),
   (SELECT creation_date
    FROM time_info
    WHERE is_on = 'no'
    LIMIT 0,1)
FROM time_info;

我想计算日期差异，但事情并非如此。还有另一种方法吗？

Answer 1

你的牙套＆＃39;（＆＃39;，＆＃39;）＆＃39;在SELECT语句中不平衡。

Answer 2

试试这个

   SELECT DATEDIFF(t1.creation_date,t2.creation_date )
   FROM time_info t1
   INNER JOIN time_info t2 ON t1.your_id_column = t2.your_id_column
   WHERE t1.is_on = 'yes'  AND t2.is_on = 'no';

Answer 3

试试这个

set @date1:=(SELECT creation_date
   FROM time_info
   WHERE is_on = 'yes'
   LIMIT 0,1);

set @date2:=   (SELECT creation_date
    FROM time_info
    WHERE is_on = 'no'
    LIMIT 0,1);
select datediff(@date1,@date2);

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