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 ...

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

Use aggregate functions for comparison In addition to using subselects to examine data in related tables, it’s also possible to use an aggregate function in a WHERE clause subselect to make a ...

I'm trying to come up with a query format that will allow me to return multiple rows of aggregate data grouped by DATE, but the date values would be BETWEEN certain intervals.As in, the data would ...