Question

所以生产者表模式是这样的：

producer_id = int PK
producer_name = varchar
is_restaurant = boolean
is_farm = boolean
is_distributor = boolean

我想要一个执行此操作的查询：

选择其producer_id的所有生产者在（11895,11976,11457）是无论是农场，餐厅还是农场分配器

我有这个：

SELECT `pd`.`producer_id` AS producer_id, `pd`.`producer` AS producer, `pd`.`is_restaurant`, `pd`.`is_restaurant_chain`, `pd`.`is_farm`, `pd`.`is_farmers_market`, `pd`.`is_distributor`, `pd`.`is_manufacture`, `ad`.`address_id`, `ad`.`address`, `ad`.`state_id`, `ad`.`city`, `ad`.`city_id`, `ad`.`country_id`, `ad`.`zipcode`, `ad`.`latitude`, `ad`.`longitude`, `cu`.`custom_url` AS custom_url
FROM (`producer` AS pd)
JOIN `address` AS ad ON `pd`.`producer_id`=`ad`.`producer_id`
LEFT JOIN `custom_url` AS cu ON `cu`.`producer_id`=`pd`.`producer_id`
WHERE `is_farm` = 1
OR `is_distributor` = 1
OR `is_restaurant` = 1
AND `pd`.`producer_id` IN ('181176', '181180', '176080', '5') 
GROUP BY `ad`.`address_id`
LIMIT 10

但查询仅对is_farm，is_distributor和is_restaurant应用WHERE条件，并且不对producer_id应用AND子句。

我想知道我是否可以使用子查询“无论是餐馆经销商还是农场”，只需将其插入带有AND子句的查询中。

我该怎么做才能解决这个问题？

Answer 1

您的问题是，在SQL中，AND优先于OR，因此您只需要括号：

SELECT `pd`.`producer_id` AS producer_id, `pd`.`producer` AS producer, `pd`.`is_restaurant`, `pd`.`is_restaurant_chain`, `pd`.`is_farm`, `pd`.`is_farmers_market`, `pd`.`is_distributor`, `pd`.`is_manufacture`, `ad`.`address_id`, `ad`.`address`, `ad`.`state_id`, `ad`.`city`, `ad`.`city_id`, `ad`.`country_id`, `ad`.`zipcode`, `ad`.`latitude`, `ad`.`longitude`, `cu`.`custom_url` AS custom_url
FROM (`producer` AS pd)
JOIN `address` AS ad ON `pd`.`producer_id`=`ad`.`producer_id`
LEFT JOIN `custom_url` AS cu ON `cu`.`producer_id`=`pd`.`producer_id`
WHERE (`is_farm` = 1 -- NOTE: Opening bracket to bracket up your OR terms together
OR `is_distributor` = 1
OR `is_restaurant` = 1) -- NOTE: Closing bracket
AND `pd`.`producer_id` IN ('181176', '181180', '176080', '5') 
GROUP BY `ad`.`address_id`
LIMIT 10

推论：

在SQL A OR B OR C AND D中解析为(A OR (B OR (C AND D)))。应用括号将更正此常见错误，即(A OR B OR C) AND D。

请记住：在混合AND和OR条款时，请始终使用括号！

Answer 2

这应该可以解决问题：

SELECT `pd`.`producer_id` AS producer_id, `pd`.`producer` AS producer, `pd`.`is_restaurant`, `pd`.`is_restaurant_chain`, `pd`.`is_farm`, `pd`.`is_farmers_market`, `pd`.`is_distributor`, `pd`.`is_manufacture`, `ad`.`address_id`, `ad`.`address`, `ad`.`state_id`, `ad`.`city`, `ad`.`city_id`, `ad`.`country_id`, `ad`.`zipcode`, `ad`.`latitude`, `ad`.`longitude`, `cu`.`custom_url` AS custom_url
FROM (`producer` AS pd)
JOIN `address` AS ad ON `pd`.`producer_id`=`ad`.`producer_id`
LEFT JOIN `custom_url` AS cu ON `cu`.`producer_id`=`pd`.`producer_id`
WHERE `pd`.`producer_id` IN ('181176', '181180', '176080', '5')
AND (`is_distributor` = 1 OR `is_restaurant` = 1 OR `is_farm` = 1)
GROUP BY `ad`.`address_id`
LIMIT 10

MySQL分组OR和AND子句

2 个答案: