加入的多个where条件

Question

我一直被一个问题困住了。

我有 table 个 orders 客户，我想得到 4 种类型的结果，例如

1st: All orders with status=place

然后2nd: All orders with status=place and customer is new（此客户之前订单table没有记录），

然后3rd: All orders with status=place and customer have at least 1 order delivered and never returned previous order,

然后 4th: All orders with status=place and customer have atleast 1 order with status=returned

第 1 步的查询工作正常，但我不知道如何让其他 results.I 知道这就像一项任务，但我需要帮助。

我的尝试第一步

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o  
WHERE (o.order_status_id = '1' 
AND o.payment_code <> 'paytabs' 
AND o.payment_code <> 'pp_express') 
ORDER BY o.order_id DESC

这给了我完美的结果 one.I 我正在使用 OpenCart 2.2.0.0

数据库结构

|order_id |status | payment_code |customer_id |
|---------|-------|--------------|------------|
| 10      | place | cod          |   5        |
| 11      | delvr | cod          |   4        |
| 12      | return| pp_express   |   5        |
| 13      |process| paytabs      |   2        |

如有任何帮助或建议，我们将不胜感激。向我要任何你需要的东西。

Answer 1

我认为当你想用一个查询做到这一点时，你应该使用 Union。

其他方式，当同一客户满足2个条件时，您只会看到一个。

https://www.w3schools.com/sql/sql_union.asp

Answer 2

对于第二个查询：您只需在 SQL 中添加一个 AND 子句： AND user_id = 0

假设插入新订单 user_id = 0 如果这是新用户

Answer 3

不确定是否了解您的数据库结构，但我会尝试...

广告 2：

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o 
WHERE (o.order_status_id = '1' 
AND o.payment_code <> 'paytabs' 
AND o.payment_code <> 'pp_express') 
AND o.customer_id NOT IN (SELECT o2.customer_id from order o2 WHERE o2.order_id != o.order_id AND o2.customer_id = o.customer_id)
ORDER BY o.order_id DESC

因此，广告 4:

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o 
WHERE (o.order_status_id = '1' 
AND o.payment_code <> 'paytabs' 
AND o.payment_code <> 'pp_express') 
AND o.customer_id IN (SELECT o2.customer_id from order o2 WHERE o2.order_status = 'returned')
ORDER BY o.order_id DESC

现在 3:

SELECT o.order_id, o.customer_id, o.order_status_id, 
FROM `order` o 
WHERE (o.order_status_id = '...?') 
AND o.customer_id NOT IN (SELECT o2.customer_id from order o2 WHERE o2.order_status = 'returned')
AND o.customer_id IN (SELECT o3.customer_id from order o3 WHERE o3.order_status = 'delivered')
ORDER BY o.order_id DESC

顺便说一句：我强烈建议重命名 table "order" 因为 "order" 是一个 SQL 关键字。

Answer 4

查询：查询是根据您提出的问题进行的，您订购了 table 结构（我认为您没有创建任何列，例如 created_at 和 updated_at）。

select * 来自状态 = 'place' 的订单；
select orders.order_id ,orders.customer_id 来自订单状态 = 'place' GROUP BY order_id, customer_id HAVING计数(customer_id) = 1;
select a.order_id, a.customer_id 来自订单 a where a.status in (select b.status 来自订单 b其中 a.order_id = b.order_id and status <> 'return') and a.status = 'place' GROUP BY a.order_id, a.customer_id HAVING COUNT( a.customer_id) >= 1;
select a.order_id, a.customer_id 来自订单 a where a.status in (select b.status 来自订单 b其中 a.order_id = b.order_id and status = 'return') and a.status = 'place' GROUP BY a.order_id, a.customer_id HAVING COUNT(a.customer_id) >= 1

加入的多个where条件

multiple where conditions with joining

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