SQL Select Statement For Calculating A Running Average Column

Question

I am trying to have a running average column in the SELECT statement based on a column from the n previous rows in the same SELECT statement. The average I need is based on

Answer 1

Want to improve this post? Provide detailed answers to this question, including citations and an explanation of why your answer is correct. Answers without enough detail may be edited or deleted.

Check out some solutions here. I'm sure that you could adapt one of them easily enough.