SQL window functions provide extremely powerful and useful features that let you work with observations more easily. Different types explained here.

Sql has lacked good statistical functions since day dot.<br><br>Some years ago I developed procedures to produce the Mode, Mode with a % of Outliers removed, Median, Median with a % of Outliers ...

If you have an aggregation function (sum, avg, count) in your select clause or if you have a group by clause, all of your columns must be aggregated or grouped.<BR><BR>In the version of SQL that I ...