Question

我正在尝试使用以下查询计算接下来7天的预订数量。

select calendarDate, 
   (
    select COUNT(*)
    FROM isBooked INNER JOIN booking
    ON isbooked.BookingID = booking.bookingID
    where specificday between booking.startDate and booking.endDate
    ) 
from calendar as specificday
where calendardate between  '2015-08-23' and DATE_ADD('2015-08-23', INTERVAL 6 DAY);

我使用的SQL服务器允许使用＆＃39;作为特定日期＆＃39;但MySQL没有，我将如何在mysql中重写查询。

Answer 1

specificday指的是表，而不是列。您需要WHERE子句的列名：

select c.calendarDate, 
       (select COUNT(*)
        from isBooked ib INNER JOIN
             booking b
             ON ib.BookingID = b.bookingID
        where c.calendarDate between b.startDate and b.endDate
       ) 
from calendar c
where c.calendardate between '2015-08-23' and DATE_ADD('2015-08-23', INTERVAL 6 DAY);

子查询中的MySQL count（）

1 个答案: