Question

我有SELECT给我一个特定月份的公寓预订日期：

SELECT db.the_date, db.id_state, db.id_client_booking, bs.class 
    FROM `day_bookings` as db 
    LEFT JOIN `bookings_states` as bs ON bs.id= db.id_state 
    WHERE id_item= 10
    AND YEAR(the_date)= 2016
    AND MONTH(the_date) = 6

如何将上个月的最后一天添加到此查询中？

我考虑过在第5个月使用相同的查询执行新的LEFT JOIN，但无法使其工作，语法错误始终存在。

我尝试UNION ALL有两个相似的选择，只得到了最后一个。我也尝试过嵌套SELECT，但它没有通过语法错误。

有关如何将上个月添加到此结果的任何建议吗？

Answer 1

试试这个：

SELECT db.the_date, db.id_state, db.id_client_booking, bs.class 
    FROM `day_bookings` as db 
    LEFT JOIN `bookings_states` as bs ON bs.id= db.id_state 
    WHERE id_item= 10
    AND YEAR(the_date)= 2016
    AND (MONTH(the_date) = 6 OR (MONTH(the_date) = 5 AND DAY(the_date) = 31))
    ;

您需要

OR 子句。

Answer 2

使用

进行管理

AND the_date BETWEEN DATE_SUB('2016-06-01', INTERVAL 1 DAY) AND LAST_DAY('2016-06-01')

这种方式适用于每个月，尽管长度为28,30或31个月。

所以最终查询是：

SELECT db.the_date, db.id_state, db.id_client_booking, db.id_item, bs.class 
    FROM `day_bookings` as db 
    LEFT JOIN `bookings_states` as bs ON bs.id= db.id_state 
    WHERE id_item= 10
    AND YEAR(the_date)= 2016
    AND the_date BETWEEN DATE_SUB('2016-06-01', INTERVAL 1 DAY) AND LAST_DAY('2016-06-01')

将上个月的日期添加到“选择”

2 个答案: