sql - Oracle SQL 将来自同一个表的 2 个查询与 2 个不同列中的输出相结合

Question

我正在使用 Oracle SQL 数据库。我正在尝试将这两个查询合并为一个来自同一个表的查询：

select count(CustomerID) from Customers
where (City = 'Berlin' or City = 'London')
from Customers;

select count(CustomerID) from Customers
where (City = 'Mannheim' or City = 'Strasbourg')
from Customers;

我的输出希望类似于在 2 列上导出：

| Berlin & London | Mannheim & Strasbourg |
|-----------------------------------------|
|        5        |         10            |

这里的 db 示例，https: //www.w3schools.com/sql/trysql.asp?filename=trysql_op_in

我认为答案将是：

(select count(CustomerID) from Customers
where (City = 'Berlin' or City = 'London'))
union
(select count(CustomerID) from Customers
where (City = 'Marseille' or City = 'Tsawassen'));
union
(select count(CustomerID) from Customers
where (City = 'Strasbourg' or City = 'Madrid'));

还在测试.​​..

终于通过使用这个案例完成了工作。感谢所有参与的人！

SELECT
  COUNT(CASE
    WHEN  work_zone = 'AMBGI01' OR
          work_zone = 'AMBGI02' OR
          work_zone = 'AMBGI03' AND
          task_type = 'P' THEN work_zone
  END) "HighBay Putaways",
  COUNT(CASE
    WHEN  work_zone = 'AMBGI04' OR
          work_zone = 'AMBGI05' OR
          work_zone = 'AMBGI06' OR
          work_zone = 'AMBGI07' AND
          task_type = 'P' THEN work_zone
  END) "LowBay Putaways",
  COUNT(CASE
    WHEN  from_loc_id = 'THEWALL' AND
          task_type = 'P' THEN from_loc_id
    END) "THE WALL",
    COUNT(CASE
    WHEN  tag_id like '%' AND
          from_loc_id like 'EXPANS%' AND
           task_type = 'P' THEN tag_id
     END) "EXPANSION",
   COUNT(CASE
    WHEN  final_loc_id like '_______' AND
          (status = 'In Progress'        OR
          status = 'Released')          AND
          task_type = 'R' THEN final_loc_id
  END) "Replens"
FROM move_task;

标签： sqloracle

Answer 1

最简单的方法如下：

select count(CASE WHEN City = 'Berlin' or City = 'London' THEN City END) "Berlin & London"
     , count(CASE WHEN City = 'Mannheim' or City = 'Strasbourg' THEN City END) "Mannheim & Strasbourg"
  from Customers