Select 在 2 个日期之间，但也 select NULL 值

Question

我正在尝试运行一个查询，其中 select 日期介于 2 个值之间

OR ( `order_products`.`deleted_at` BETWEEN
                 '2021-01-01 00:00:00' AND '2021-07-28 23:59:59' )

但我还需要收集具有 NULL 值的 order_products。

这完全有可能吗，就像我把一个

OR `order_products`.`deleted_at` IS NULL

在我的代码中，它似乎只是 return absolutley 数据库中的所有内容:-(

我当前的上下文代码是：

SELECT 
`orders`.`id`, 
`orders`.`reference`, 
`orders`.`order_date`, 
`orders`.`cancellation_date`,
 `order_products`.`description`, 
`order_products`.`st_code`, 
`order_products`.`supplier_stock_code`,
 `order_products`.`status`, 
`order_products`.`deleted_at`,
 `supplier`.`name`, 
 order_invoice.created_at AS credit_date, 
fitters.account_number AS fitter_account_number, 
fitters.name AS fitter 
FROM `order_products`
 LEFT JOIN `orders` ON (`orders`.`id` = `order_products`.`order_id`) 
LEFT JOIN `supplier` ON (`order_products`.`supplier_id` = `supplier`.`id`) 
LEFT JOIN `fitters` ON (`orders`.`fitter_id` = `fitters`.`id`) 
JOIN `order_invoice` ON (`order_invoice`.`order_id` = `orders`.`id`) 
WHERE `cancellation_date` IS null 
AND `cancellation_date` BETWEEN '2021-01-01 00:00:00' AND '2021-07-28 23:59:59'
 AND `order_invoice`.`status` = 'approved' 
OR (`order_products`.`deleted_at` BETWEEN '2021-01-01 00:00:00' 
OR `order_products`.`deleted_at` IS NULL
AND '2021-07-28 23:59:59') 
AND `order_products`.`product_type` = 'product' 
ORDER BY `orders`.`id` ASC

Answer 1

请尝试将 where 条件更改为其中 cancellation_date 为空 AND cancellation_date BETWEEN '2021-01-01 00:00:00' AND '2021-07-28 23:59:59' AND order_invoice.status = 'approved' 或（order_products.deleted_at 为空或 order_products.deleted_at 在 '2021-01-01 00:00:00' 和 '2021-07-28 23:59:59') AND order_products.product_type = 'product'

Answer 2

你的语法不对。您需要：

WHERE order_products.deleted_at >= '2021-01-01' AND
      order_products.deleted_at <  '2021-07-29' OR
      order_products.deleted_at IS NULL

请注意，我使用日期不等式编写了日期时间检查，这对我来说似乎更清晰。此外，我们在这里不需要任何额外的括号，因为 AND 的优先级高于 OR.

Select 在 2 个日期之间，但也 select NULL 值

Select Between 2 dates but also select NULL values

mysql

where-clause