mysql - mysql date_add 2次在程序中

Question

我想在一个过程中使用 Date_add 2 次，但它返回 0 行（而它应该返回行）

这是程序

 select av.*, ap.*,c.* from tbl_available av 
 left join tbl_appointment ap on av.avHours = ap.appointmenttime 
 and ap.calendarid = kalenderId 
 and ap.appointmentdate = DATE_ADD(dag, INTERVAL 6 DAY)
 left join tbl_client c on ap.clientid = c.clientid
 where av.avCalendarId = KalenderId 
 and av.avDays = DayOfweek(DATE_ADD(dag, INTERVAL 6 DAY)) 
 order by avHours;

它可以在没有 date_add 的情况下工作

提前致谢！

//编辑

我现在拥有的：

select av.*, ap.*,c.*, ab.absentid from tbl_available av 
left join tbl_appointment ap on av.avHours = ap.appointmenttime 
and ap.calendarid = kalenderId 
and ap.appointmentdate BETWEEN dag AND DATE_ADD(dag, INTERVAL 6 DAY)
and (av.avDays = DayOfweek(ap.appointmentdate) OR ap.appointmentdate IS NULL)
left join tbl_client c on ap.clientid = c.clientid
left join tbl_absent ab on av.avHours = ab.ababsent
and ab.abHoliday = dag
and ab.abCalendarID = kalenderId
where av.avCalendarId = kalenderId 
order by avDays,avHours;

但是没有获取 ab.absentid，这是为什么呢？:(

Answer 1

我不确定您到底想要什么，但在整个星期内，请尝试以下操作：

select av.*, ap.*,c.* from tbl_available av 
left join tbl_appointment ap on av.avHours = ap.appointmenttime 
and ap.calendarid = kalenderId 
and ap.appointmentdate BETWEEN dag AND DATE_ADD(dag, INTERVAL 6 DAY)
and (av.avDays = DayOfweek(ap.appointmentdate) OR ap.appointmentdate IS NULL)
left join tbl_client c on ap.clientid = c.clientid
where av.avCalendarId = KalenderId 
order by avHours;

我BETWEEN用来指定ap.appointmentdate. 更改为与没有约会的行av.avDays相关ap.appointmentdate或也显示没有约会的行（假设这种行为是因为你有一个LEFT JOINon tbl_appointment）。我已经离开了，DayOfweek(dag) ...因为您正在查看整整一周，所以这是多余的。