所以我编写了这段代码:
SELECT
day.weekday
FROM
day,
event,
event_date
WHERE
EXISTS( SELECT
day.weekday
FROM
day)
AND event.event_id = event_date.event_id
AND event.day= day.day
GROUP BY day.weekday
它正在工作,但是还有其他方法可以使用 EXSISTS 做到这一点吗?
最佳答案
试试这个
SELECT
day.weekday
FROM
day
JOIN event ON event.day= day.day
JOIN event_date ON event.event_id = event_date.event_id
GROUP BY
day.weekday
关于mysql - 从日程中选择日期,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27093128/