Average of grouped rows in Sql Server

Question

I have an Sql Server Table.. it\'s something like this:

Id ...... Column1 ...... Column2  
````````````````````````````````  
1 ........ 1 ............. 34  
2 ..         


        

Answer 1

Execute the following SQL from average :

select column1,avg(column2) from tablename group by column1;