MySQL case语句错误，部分查询数据未显示

MySQL案例语句错误：

当我将以下内容作为单独的案例使用时，查询是有效的，但是当组合使用时，它们就不起作用了

我正在使用MySQL工作台

错误：
仅返回制造商信息，不返回基于ProdID的查询。
ProdID是正确的，在此之前我使用它来提取ID，它返回正确的ID

我要求他们在1列中运行下一步的计算

不工作：

CASE 
    When(T4.manufacturers_id = 1) then ''
    When(T4.manufacturers_id = 2) then '.10'
    When(T4.manufacturers_id = 3) then '.10'
    When(T4.manufacturers_id = 4) then '0'
    When(T3.products_id = 11) then '.10'
    When(T3.products_id = 34) then '.10'
    When(T3.products_id = 35) then '.10'
    When(T3.products_id = 36) then '.10'
    When(T3.products_id = 37) then '.10'
    When(T3.products_id = 38) then '.10'
    When(T3.products_id = 39) then '.10'
end As Comms,

工作：

CASE 
    When(T4.manufacturers_id = 1) then ''
    When(T4.manufacturers_id = 2) then '.10'
    When(T4.manufacturers_id = 3) then '.10'
    When(T4.manufacturers_id = 4) then '0'
end As MIDComms,

case
    When(T3.products_id = 11) then '.10'
    When(T3.products_id = 34) then '.10'
    When(T3.products_id = 35) then '.10'
    When(T3.products_id = 36) then '.10'
    When(T3.products_id = 37) then '.10'
    When(T3.products_id = 38) then '.10'
    When(T3.products_id = 39) then '.10'
end As PIDComms,

    CASE 
    When(T4.manufacturers_id = 1) then ''
    When(T4.manufacturers_id = 2) then '.10'
    When(T4.manufacturers_id = 3) then '.10'
    When(T4.manufacturers_id = 4) then '0'
    When(T3.products_id = 11) then '.10'
    When(T3.products_id) between 34 and 39 then '.10'
end As Comms,  

理想情况下，我希望它是：

CASE 
    When(T4.manufacturers_id = 1) then ''
    When(T4.manufacturers_id = 2) then '.10'
    When(T4.manufacturers_id = 3) then '.10'
    When(T4.manufacturers_id = 4) then '0'
end As MIDComms,

case
    When(T3.products_id = 11) then '.10'
    When(T3.products_id = 34) then '.10'
    When(T3.products_id = 35) then '.10'
    When(T3.products_id = 36) then '.10'
    When(T3.products_id = 37) then '.10'
    When(T3.products_id = 38) then '.10'
    When(T3.products_id = 39) then '.10'
end As PIDComms,

    CASE 
    When(T4.manufacturers_id = 1) then ''
    When(T4.manufacturers_id = 2) then '.10'
    When(T4.manufacturers_id = 3) then '.10'
    When(T4.manufacturers_id = 4) then '0'
    When(T3.products_id = 11) then '.10'
    When(T3.products_id) between 34 and 39 then '.10'
end As Comms,  

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提前感谢

一个

case

语句只返回一个值，即遇到的第一个值。也许您需要某种连接：

CONCAT_WS(':',
          (CASE When(T4.manufacturers_id = 1) then ''
                When(T4.manufacturers_id = 2) then '.10'
                When(T4.manufacturers_id = 3) then '.10'
                When(T4.manufacturers_id = 4) then '0'
           END),
          (CASE When(T3.products_id = 11) then '.10'
                When(T3.products_id = 34) then '.10'
                When(T3.products_id = 35) then '.10'
                When(T3.products_id = 36) then '.10'
                When(T3.products_id = 37) then '.10'
                When(T3.products_id = 38) then '.10'
                When(T3.products_id = 39) then '.10'
           end) ) As Comms,

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非常感谢，我知道这将是一件简单的事情，我只是不知道该怎么办：）太好了。