Question

我有以下查询

Select 
case upper(device_model)
        when 'IPHONE' then 'iOS - iPhone'
        when 'IPAD' then 'iOS - iPad'
        when 'IPOD TOUCH' then 'iOS - iPod Touch'
        Else 'Android'
        End As Device_Model,
count(create_dtime) as Installs_Oct17_Oct30
From Player
Where Create_Dtime >= To_Date('2012-Oct-17','yyyy-mon-dd')
And Create_Dtime <= To_Date('2012-Oct-30','yyyy-mon-dd')
Group By Device_Model
Order By Device_Model

这会吐出多行结果，显示为“Android”....我希望只有4行结果，每种情况一个....所以它出现如下：

Device_Model     Installs_Oct17_Oct30
Android            987
iOS - iPad         12003
iOS - iPhone       8563
iOS- iPod Touch    3482

Answer 1

您正在按字段device_model进行分组，而不是您的表达式：

Select 
case upper(device_model)
    when 'IPHONE' then 'iOS - iPhone'
    when 'IPAD' then 'iOS - iPad'
    when 'IPOD TOUCH' then 'iOS - iPod Touch'
    Else 'Android'
    End As Device_Model,
count(create_dtime) as Installs_Oct17_Oct30
From Player
Where Create_Dtime >= To_Date('2012-Oct-17','yyyy-mon-dd')
And Create_Dtime <= To_Date('2012-Oct-30','yyyy-mon-dd')
Group By
case upper(device_model)
    when 'IPHONE' then 'iOS - iPhone'
    when 'IPAD' then 'iOS - iPad'
    when 'IPOD TOUCH' then 'iOS - iPod Touch'
    Else 'Android'
    End
Order By Device_Model

Answer 2

不需要大字段的GroupBy ...只需使用下面的简单查询.. [你的sql] 分组1 按Device_Model排序

这意味着您在选择查询中按字段1进行分组..或者尝试给出别名... 按别名分组按device_model排序

SQL Oracle结合多个结果行

2 个答案: