Getting zero instead of Blank value

Why below code give开发者_如何转开发s me 0 or zero instead of blank value or blank row in column ValueA.

How can I change it to blank value?

select ValueA = case when ValueB = 'No' then ValueA
                     when ValueB = 'Yes' then ''
                     else ''
                     end
From Table

or

if I use ValueB = 'Yes' then CAST(NULL AS varchar(25)) gives me Null and I want blank where it is Null, but when I try to convert to blank I get zero. Why?

How can I get blank?

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Sounds like ValueA is equal to 0.

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Because valueA is a number, and it can't contain a "blank row". It's either going to be 0 or NULL. If you want blanks, you need to use varchar or an equivalent character field.

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ValueA must be a numeric data type. Also, your WHEN 'Yes' and ELSE are redundant. Try:

SELECT ValueA = CASE ValueB 
       WHEN 'No'  THEN CONVERT(VARCHAR(25), ValueA)
       ELSE '' END
FROM dbo.[Table];

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select
    case when ValueB = 'No' then Cast(ValueA as VarChar(10))
         when ValueB = 'Yes' then '' 
         else '' 
         end as ValueA
    From Table