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SQL remove column when all null

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Execution time: 0,02 sec, rows selected: 4, rows affected: 3, absolute service time: 0,19 sec 
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sql server version



1
Microsoft SQL Server 2014 - 12.0.2000.8 (Intel X86) 
	Feb 20 2014 19:20:46 
	Copyright (c) Microsoft Corporation
	Express Edition on Windows NT 6.3 <X64> (Build 9600: ) (WOW64) (Hypervisor)






  
first_name



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Mary



2
Mark



3
Michael






    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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