Arka Bhattacharjee's questions

我有两张桌子

第一张表：center（2 列）

+-----------------------------------+
|id | company_name                  |
+-----------------------------------+ 
|2  | Skytel Outsourcing Pvt. Ltd.  |
+-----------------------------------+

第二表：campaign_center（3 列）

+-------------------------------------+
|campaign_id |  Center_id  | sl_no    |
+-------------------------------------+ 
|Demo        |    2        | 2        |
+-------------------------------------+
|MyFootPath  |    2        | 3        |
+-------------------------------------+

当我执行此查询时，它运行良好：（查找center_id和公司名称campaignid是谁'Demo'）

select center.id, center.company_name 
from center 
  inner join campaign_center 
  on center.id = campaign_center.center_id 
where campaign_center.campaign_id = 'Demo'

但是当我试图找到那些campaign_id不是的公司时，'Demo'它又没有给出正确的输出：

select center.id, center.company_name 
from center 
  inner join campaign_center 
  on center.id = campaign_center.center_id 
where campaign_center.campaign_id != 'Demo'

我如何得到那些？请帮忙。

+----+----------+-----+-----------+----------+
| ID | NAME     | AGE | ADDRESS   | SALARY   |
+----+----------+-----+-----------+----------+
|  1 | Ramesh   |  32 | Ahmedabad |  2000.00 |
|  2 | Khilan   |  25 | Delhi     |  1500.00 |
|  3 | kaushik  |  23 | Kota      |  2000.00 |
|  4 | Chaitali |  25 | Mumbai    |  6500.00 |
|  5 | Hardik   |  27 | Bhopal    |  8500.00 |
|  6 | Komal    |  22 | MP        |  4500.00 |
|  7 | Muffy    |  24 | Indore    | 10000.00 |
+----+----------+-----+-----------+----------+ 

询问：

更新客户设置地址 = 'Pune' 其中 ID = 6;

成功执行此查询后，如何返回上一阶段？

我已经尝试回滚，但它不起作用。

我的引擎是InnoDB。