In my blog, th flip side, I mention that the post should be concise yet detaled. Sort of an oxymoron, but it works.. The code should be well formatted with appropriate white space. The sample data readily consumbable without reformatting. The sample data easily comparable to the output.

You only need enough of an explaination so that people can understand the problem. They don't need all the details of the system, nor necessarily all the data from the tables, either in rows or columns. Just what is needed to understand and assist in solving the problem.