SQL选择上个月的数据

Question

I am able using the code below to select data from any number of days in the past but what if I only want the data from the previous month, eg from 60 days ago to 30 days ago.

I thought I might be able to use INTERVAL 60 - 30 , but I am not sure that is working...

SELECT
    product,
    COUNT(OrderNumber) AS CountOf
FROM
    orders
WHERE
    STATUS = 'booking' AND
    Date(OrderDate) <= CURDATE() AND 
    Date(OrderDate) > DATE_SUB(CURDATE(),INTERVAL 30 DAY)

GROUP BY
    product
ORDER BY CountOf DESC

Thoughts?

Answer 1

This is too long for a comment:

Date(OrderDate) < DATE_SUB(CURDATE(), INTERVAL 30 DAY) AND 
Date(OrderDate) >= DATE_SUB(CURDATE(), INTERVAL 60 DAY)

Note: if OrderDate is already a date, then don't use the DATE() function. It can prevent the use of indexes.

Even if OrderDate has a time component, you probably still don't need the DATE() function.

Answer 2

Do you know about the MySQL functions MONTH() and NOW() ? You can use these in your where clause:

MONTH(OrderDate) = MONTH(NOW()) - 1

Of course, this needs to be fine tuned for example for years (to get December if it is January).

Answer 3

我相信DATE_SUB()函数支持将MONTH用作间隔，因此，如果您希望从当前日期起获取上个月的数据，则应该可以使用MONTH ：

Date(OrderDate) > DATE_SUB(CURDATE(),INTERVAL 1 MONTH)

Answer 4

You can use something like this

SELECT
    product,
    COUNT(OrderNumber) AS CountOf
FROM
    orders
WHERE
    STATUS = 'booking' AND
    YEAR(orderdate) = YEAR(CURRENT_DATE - INTERVAL 1 MONTH)
    AND MONTH(orderdate) = MONTH(CURRENT_DATE - INTERVAL 1 MONTH)   
GROUP BY
    product
ORDER BY CountOf DESC