关于php：尝试从mysql获取上个月的数据

Trying to fetch last month data from mysql

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我正在尝试从mysql调用上个月的数据，但它也提供了前几年的数据，例如2011年8月，2012年8月.... 2015年8月。我使用了不同的函数来获取上个月的间隔但没有成功。这意味着来自数据库的订单总和也不正确。

查询1：

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SELECT sku,
order_date,
sum(`order_total`) AS sales
FROM `tableOrder`
WHERE `order_status`='Shipped'
AND MONTH(STR_TO_DATE(order_date, '%m/%d/%Y')) = MONTH(CURDATE() - INTERVAL 1 MONTH)
GROUP BY STR_TO_DATE(order_date, '%m/%d/%Y')
ORDER BY sales DESC

查询2：

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SELECT sku,
order_date,
sum(`order_total`) AS sales
FROM `tableOrder`
WHERE `order_status`='Shipped'
AND MONTH(STR_TO_DATE(order_date, '%m/%d/%Y')) = MONTH(DATE_ADD(Now(), INTERVAL -1 MONTH))
GROUP BY STR_TO_DATE(order_date, '%m/%d/%Y')
ORDER BY sales DESC

添加年份的附加条件：

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SELECT sku,order_date,sum(`order_total`) as sales FROM `tableOrder`
WHERE `order_status`='Shipped'
AND MONTH(STR_TO_DATE( order_date, '%m/%d/%Y' )) = MONTH(CURDATE() - INTERVAL 1 MONTH)
AND YEAR(order_date) = YEAR(NOW())
GROUP BY STR_TO_DATE( order_date, '%m/%d/%Y' )
ORDER BY sales desc