Question

我从员工表中获取各种状态，该员工表有230个记录，状态低于5。我已经编写了查询以获取每个状态的计数但现在需要将状态A和B的组合计数为AB。

我的查询：

SELECT DISTINCT Status AS Status,
           COUNT(Status ) AS StatusCount
    FROM EMPLOYEE
    GROUP BY Status

我的查询输出是：

Status    Count
A           100
B           50
C           30
D           10
E           40

我希望结果为A＆amp; B组合并保持不变。

Status      Count
A&B          150
C             30
D             10
E             40

Answer 1

使用case

SELECT case when Status in ('A','B') 
            then 'A&B'
            else Status
       end AS Status,
       COUNT(Status) AS StatusCount
FROM EMPLOYEE
GROUP BY case when Status in ('A','B') 
              then 'A&B'
              else Status
         end

Answer 2

使用也可以使用decode

SELECT decode(status,'A','A&B','B','A&B',status) AS Status,
       COUNT(status) AS StatusCount
FROM EMPLOYEE
GROUP BY decode(status,'A','A&B','B','A&B',status) AS Status

如何获取Oracle中特定记录的计数？

2 个答案: