The code snippet: ```sql Avg(dbo_remark_dpgmodel_seg_stats.tally) AS AvgOftally ``` is part of a SQL query....

The code snippet:

Avg(dbo_remark_dpgmodel_seg_stats.tally) AS AvgOftally

is part of a SQL query. Here's what it does:

1. Avg() function: The Avg() function calculates the average (mean) of a numeric column. In this case, it is computing the average value of the tally column from the dbo_remark_dpgmodel_seg_stats table.

2. dbo_remark_dpgmodel_seg_stats: This is the table where the tally column resides. The prefix dbo_ suggests that this table is in the dbo schema, which is the default schema in many SQL databases such as Microsoft SQL Server.

3. AS AvgOftally: This is a column alias, which renames the result of the Avg() function to "AvgOftally" in the output. This makes it easier to reference the result in the query output or subsequent operations.

To summarize, this code calculates the average value of the tally column from the dbo_remark_dpgmodel_seg_stats table and names the result as AvgOftally in the query output.