sql server 2008 - Can I use a SQL case to choose the Table? -

I am trying and getting an error.

  SELECT COUNT (*) FROM case @ Type 'username' then user where user name = @name; When 'UserGroup' is the group where GroupName = @GroupName and GroupType = 'USERGROUP' END    I know that you usually use the case after the '=' symbol. .. but is there any way I am trying here?  
 SQL Server 2008   
 
  You either have to type dynamic SQL and execute it, or if we have an IF statement and two Ask the question ...  
  IF (@type = 'UserName') from user SELECT COUNT (*) where user name = @name ELSE if group (@ type = usergroup ') group Select (*) where groupname = @ group name and group type = 'USERGROUP'    

 


  







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