DATEDIFF()函数

Question

我必须找出两个日期的差异(日期必须从字符串转换为日期格式)。我正在使用以下mysql查询

SELECT DATEDIFF
(
        (SELECT STR_TO_DATE(create_date, '%e %b %Y  %k:%i') AS create_date FROM booking) AS date1
        ,
        (SELECT STR_TO_DATE(start_date, '%e %b %Y  %k:%i') AS start_date FROM booking) AS date2
) diff 

单独地，内部查询成功地工作。日期格式转换正确，例如从5 Mar 1985 2:33转换为1985-03-05 02:33:00

Answer 1

是什么在阻止你

SELECT
  DATEDIFF( 
    STR_TO_DATE(create_date, '%e %b %Y  %k:%i'),
    STR_TO_DATE(start_date, '%e %b %Y  %k:%i')
  ) AS diff
FROM booking