SQL: Alias Column Name for Use in CASE Statement -

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Is it possible for the column name of the name and then use it in a case statement? For example, select 

  as the case of col1, when a = 'test' then 'yes' in the form of the END table;

I am trying to surname the column because in reality my case statement programmatic will arise, and I want the column to be in the case statement with the second to be specified in SQL Instead of using the parameter in the program

I think mySql and MsSql will not allow this because they will try all the columns in the CAE section Find the columns in the WHERE section as tables.

I do not know what you are talking about, but I think you can do anything like this in DBMS: 

  SELECT *, in case When a = 'test' then 'yes' as the value of the value (select 1 as a table from 1) q

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