sql - Executing different queries depending on case statement -

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I have a column called 'caller', which contains several values ​​i when the value of this column is 'major' , Then I want to execute the following: 

  choose * from students *;   
 And when there is something else, I want to execute:  
  Choose from students differently;   
 I used the case statement in the past to return a value. How can they be made to return a complete query? Alternatively, how can this problem be addressed without any problem?  
 Any help is appreciated.   
 
 I was giving a try on this. Basically, it gives you all the results for the Major and then adds other results.  
  Select students where the solution = 'Major' UNION's selection body * Where the students will get the solution & lt; & Gt; 'Major'

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