Question

如果我有日期列，例如“2013-05-05”，如何选择以前的记录？我试过了

SELECT DATE, percent_change
FROM aa
WHERE DATE >2012 -12 -31
ORDER BY DATE DESC 
LIMIT 1

Answer 1

假设日期是唯一的密钥：

SELECT `date`, percentage_change FROM aa WHERE `date`>'2012-12-31' ORDER BY `date` DESC LIMIT 1;

然后，获取上一条记录：

SELECT `date`, percentage_change FROM aa WHERE `date`>'2012-12-31' ORDER BY `date` DESC LIMIT 1 OFFSET 1;

之前的记录：

SELECT `date`, percentage_change FROM aa WHERE `date`>'2012-12-31' ORDER BY `date` DESC LIMIT 1 OFFSET 2;

等

Answer 2

要在给定日期之前获取记录，这应该有效：

SELECT DATE, percent_change 
FROM aa 
WHERE DATE < '2013-05-05' 
ORDER BY DATE DESC
LIMIT 1