sql - Custom aggregate functions -


How does one collect a custom in SQL Server 2012? I am trying to get an average total.

Something like this: 

 ; With CT (select the top 50 percent of the tablet by the Vel Dell) select the top 1 CT    
 
 
 you should just use the built-in function,  percentile_cont ()  or  percentil_disc ()  (see), how you define the median for any number of records Depends on what it does.  
 I think the following is what you want:  
  Choose percentile_cont (0.5) within the group (sorted by the wall) in the form of TBL in the middle;   
 This is very easy to define your own function.

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