Question

刚刚学习SQLite ......我运行这个查询：

select guests.[GUEST_NAME],guests.[GUEST_SURNAME],guest_data.[START_DATE],guest_data.[END_DATE]
from guests
INNER JOIN guest_data
ON guests.guest_id=Guest_data.guest_id
order by  guests.[GUEST_SURNAME] ASC

这项工作正常但我需要学习：如何获得额外的字段作为DAYS 作为start_date，end_date之间的datediff？我尝试添加：

 select guests.[GUEST_NAME],guests.[GUEST_SURNAME],guest_data.[START_DATE],guest_data.[END_DATE],DAYS as Daysbetween(guest_data.start_date,guest_data.end_date)

但它不起作用。如何在delphi中编写此查询？

Answer 1

select guests.[GUEST_NAME],guests.[GUEST_SURNAME],guest_data.[START_DATE],guest_data.[END_DATE],
julianday(guest_data.end_date) - julianday(guest_data.start_date) AS DAYS_INTERVAL
from guests
INNER JOIN guest_data
ON guests.guest_id=Guest_data.guest_id
order by  guests.[GUEST_SURNAME] ASC

请尝试这种语法结构并让我们发布。您的天数间隔应作为名为“DAYS_INTERVAL”

的结果集中的单独列返回

sqlite - 两个日期字段之间的日差异

1 个答案: