Oracle SQL將來自同一表的2個查詢與2個不同列中的輸出結合起來

Question

我正在使用Oracle SQL數據庫。 我正在嘗試將這兩個查詢合並到同一張表中的一個查詢中：

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;

我的輸出想像是在兩列上導出的：

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

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

我認為答案將是：

(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'));

仍在測試中...

最終通過使用這種情況完成了工作。 感謝所有參與的人！

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;

Answer 1

尚不清楚您有兩個表（ customers ， country ）還是一個。 如果有兩個，則需要向我們展示結構。 w3schools.com說沒有像country這樣的表格， customers不包含store欄。 無論如何，您都需要條件count ，如下所示：

select count(case when city in ('Berlin', 'London')       
                  then 1 end) as "Berlin & London",
       count(case when city in ('Mannheim', 'Strasbourg') 
                  then 1 end) as "Mannheim & Strasbourg"
  from Customers
  where city in ('Berlin', 'London', 'Mannheim', 'Strasbourg')

您也可以使用pivot ，但這更簡單，更易讀，並且可以在較早的Oracle版本中使用。

Answer 2

最簡單的方法如下：

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