MySQL计数（*）未来7天每天

我有以下查询，它统计选定日期的预订数量

 select count(*) 
 from  isBooked inner join booking
 on isbooked.BookingID = booking.bookingID
 where '2015-08-09' between booking.startDate and booking.endDate;

例如，我希望在接下来的7天内运行此查询并显示每天的计数

day     count
1        10
2        9
3        18
4        6
5        1
6        9
7        14

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基本上，它可以是7个查询的并集：

(
    SELECT CURDATE() AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE CURDATE() BETWEEN booking.startDate and booking.endDate;
)
UNION ALL
(
    SELECT DATE_ADD(CURDATE(), INTERVAL 1 DAY) AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE DATE_ADD(CURDATE(), INTERVAL 1 DAY) BETWEEN booking.startDate and booking.endDate;
)
UNION ALL
(
    SELECT DATE_ADD(CURDATE(), INTERVAL 2 DAY) AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE DATE_ADD(CURDATE(), INTERVAL 2 DAY) BETWEEN booking.startDate and booking.endDate;
)
UNION ALL
(
    SELECT DATE_ADD(CURDATE(), INTERVAL 3 DAY) AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE DATE_ADD(CURDATE(), INTERVAL 3 DAY) BETWEEN booking.startDate and booking.endDate;
)
UNION ALL
(
    SELECT DATE_ADD(CURDATE(), INTERVAL 4 DAY) AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE DATE_ADD(CURDATE(), INTERVAL 4 DAY) BETWEEN booking.startDate and booking.endDate;
)
UNION ALL
(
    SELECT DATE_ADD(CURDATE(), INTERVAL 5 DAY) AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE DATE_ADD(CURDATE(), INTERVAL 5 DAY) BETWEEN booking.startDate and booking.endDate;
)
UNION ALL
(
    SELECT DATE_ADD(CURDATE(), INTERVAL 6 DAY) AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE DATE_ADD(CURDATE(), INTERVAL 6 DAY) BETWEEN booking.startDate and booking.endDate;
)

<>但是如果你有大量的数据要管理，你必须考虑在数据库上定期处理它，并将其放入一些缓存文件或其他表中。 如果你想这样做很多天，N选择的联盟将是没有效率的。在这种情况下，我建议定义一个包含日期的临时表，并在日期上使用联接执行单查询，例如：

CREATE TEMPORARY TABLE dates (day DATE); -- not necessarily temporary

INSERT INTO dates (day) values ('2015-01-01'), ....

SELECT dates.day AS Date, COUNT(*) AS Available
        FROM isBooked INNER JOIN booking
            ON isbooked.BookingID = booking.bookingID
        WHERE dates.day BETWEEN booking.startDate and booking.endDate
        GROUP BY dates.day;

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您是否考虑过将查询放在PHP文件中，设置每日cron作业，然后将这些结果添加到另一个MySQL表中？使用weekday函数？